Latest Forum Discussions

MAC Golden Gate 27 with Pegasus2 R6

2026-11-10T15:42:24.7400000

Hi Everyone,

Having problems with Pegasus 2 R6 not connecting to new mac studio.

I have updated firmware and installed DEXT driver 21.1 but mac says to connect to different USB C port but makes no difference.

Can anyone give some suggestions please

Finder takes 5+ minutes to list large folders on Pegasus DEXT volume

2026-11-10T14:24:27.4770000

Hi,

On my Mac Studio, Finder needs 5–6 minutes to show a folder of 14,400 image files on my RAID. A plain directory listing of the same folder takes 0.2 seconds, and Forklift and DaVinci Resolve show it almost instantly. Open/Save dialogs in every app have the same problem. I’ve had this for several years and several macOS versions.

Setup

Mac Studio M2 Ultra, 128 GB, macOS 27.2 (also on 26.7.1 and earlier)
G-Technology G-SPEED Shuttle XL, Thunderbolt 3 (Promise-built, PCI 105a:8870, PromiseSTEX)
Pegasus DEXT driver com.promise.driverkit.pegasus 21.1.0, the only third-party driver loaded
Volume: Mac OS Extended (Journaled), 42 TB

Measurements

Test	Files	Time
Plain directory listing, RAID	14,400	0.21 s
Finder, RAID	14,400	311–363 s
Finder, internal SSD	5,000	0.3 s
Finder, HFS+ disk image	5,000	1.5 s

What I found

A sample of Finder shows that for each file it adds, Finder calls TFSVolumeInfo::AddVolume → TCFURLInfo::SamePhysicalDevice → _mountedVolumeURLsWithPhysicalDisksMatchingVolumeAtURL, which queries DiskArbitration (DASessionCreate / DADiskCopyDescription). During one test, diskarbitrationd used 3–4 minutes of CPU, but the Pegasus driver used only 1.5 s. On other volumes, Finder doesn’t repeat this lookup.

The one difference I can find is in how the volume appears in the I/O registry. The driver attaches the IOMedia objects (@0:0, @0:1, @0:2) directly under pci105a,8870@0 in the IODeviceTree plane. As a result, DiskArbitration reports this media path:

IODeviceTree:/arm-io/apciec1@30000000/pcic1-bridge@0/pci-bridge@0/pci-bridge@1/pci105a,8870@0/@0:2

Volumes on Apple’s own storage drivers get a full IOService path through the block-storage, media and partition layers instead. My guess is that this stops Finder from caching the volume’s physical-disk mapping, so it repeats the lookup for every file.

Questions

Is attaching IOMedia in the IODeviceTree plane intended, and could the driver publish media only in the IOService plane?
Is there a newer driver or firmware that changes this?
Can you reproduce it with a folder of 10,000+ files on a Pegasus3 on Apple silicon?

Other users report the same symptom here, including one with a G-Speed Promise RAID on a Mac Studio M2 Ultra: https://forums.macrumors.com/threads/finder-slow-to-show-large-folder-contents-loading.2386040/

I can send the full Finder sample traces and a detailed PDF report.

Thanks!

VTrak E610f Boot Loop

2026-11-09T18:47:08.2300000

I'm hoping someone is able to help. We recently lost power to our VTrak E610f and three expansion chasis. Everything is powered up fine, but it appears the head unit cannot connect to the router any longer. Upon realizing that, I connected to the head until via the management port and serial-to-usb adapter and it appears to be stuck in a boot loop. This code repeats itself every couple of minutes:

PBL_ROM Ver 1.02.0000.01
Built 16:35:54, Nov 29 2007

Platform Setup completed
+execs
Load & Run: PBL_RAM
+Request IP addr from DHCP server: .............................................................
Ethernet eth0: MAC address 00:01:55:31:a2:6f
Can't get BOOTP info for device!

DHCP Enabled
Ethernet MAC address: 00:01:55:31:a2:6f
IP: 0.0.0.0/255.255.255.0, Gateway: 0.0.0.0
Default server: 0.0.0.0, DNS server IP: 0.0.0.0

PBL_RAM Ver 1.02.0000.04
Built 10:57:33, Mar 18 2009

== Executing boot script in 30.000 seconds - enter ^C to abort
PBL_RAM> execs
Software modules check OK
SDRAM Size: 0x80000000, OS Size: 0x10000000
Flash size: 0x02000000, Flash blk size: 0x00020000, blk count: 0x00000100
Using base address 0x01008000 and length 0x001c3460
Loading software modules .......

Mutiple restarts have not fixed the issue, and I'm unable to enter login info or commands via the management port. Any help would be great appreciated. Thanks!

Pegasus3 R4 with MAC OS 27

2026-11-09T14:31:43.4830000

Does Peasus3 R4 works with MAC OS 27 ?

Any issues - must I reinstall the DEXT Driver when I update to MAC OS 27 ?

TRhanks for help

Hans-Guenther

Can I disable the raid and just use the 2 individual drives? Smartstor Zero

2026-11-05T14:15:43.3570000

I just setup the Smartstor zero with 2 2gb drives and it builds a mirror raid. i do not want a raid, I just want to have 2 individual drives. If I delete the raid it just reboots and recreates it. The options to modiify the raid are greyed out and not available. My Linkstations let me use individual drives but I can't figure out how to get the smartstore to copperate. All help appreciated.

Minor event - Bad Sector on physical disk

2026-11-04T18:26:43.5770000

Using a pegusus 2 R4 with 4 physical drives. Not part of an array. I am getting a notification that says it needs my attention. When looking at events each of the 4 drives has a Severity listed as minor with the description " Bad sector is found on physical disk." What if anything should I do?

stop synchronization

2026-10-28T20:07:45.1730000

I want to reconfigure the array as RAID 6, but it seems to have started synchronizing after connecting it as the shipped RAID 5. How do I stop it?

USB Filter Driver

2026-10-28T19:08:16.3500000

Do I need the USB Filter Driver for a Pegasus32 R8 connected by Thunderbolt to an Intel Mac?

Pegasus R4 and Mac mini M1 – a drive went offline during a Time Machine backup

2026-10-28T16:46:18.5030000

Hello,
I have a Thunderbolt RAID enclosure (Promise Pegasus R4) which I use to back up my Mac mini M1 (using Time Machine).
It isn’t permanently plugged in or connected, and I only switch it on from time to time.

During the last backup, an alert sounded from the enclosure and the system told me that one of the drives (number 3) was ‘offline’ (even though I hadn’t touched anything).

I’m worried about whether my data is at risk and whether the drive has failed.

I’ve seen the following posts (and this) on the forum which seem to raise the same issue.

I’m wondering whether the solution mentioned in those posts applies to my situation.

I’m reaching out for your help so that I don’t make any mistakes that could compromise my data or the system.

Thank you in advance for any help you can provide.

Kind regards,

Jean-Jacques

(Apologies for any mistakes; I’m not a native English speaker, so I’ve used Deepl to translate this.)

MacOS 27 and Pegasus 1

2026-10-27T12:45:42.1500000

System 1 is a Pegasus (gen 1) R6 hanging off an M1 Mac Mini, currently under MacOS 26, firmware 5.04.0000.61, and Promise Utility 4.00.0000.09. Questions are:

1. Will everything continue to work as-is if I upgrade this system to MacOS 27?

2. This version of the Promise Utility is an Intel app, running under Rosetta. It will obviously not work come MacOS 28 - so is there a later, Apple Silicon, utility that is compatible with the gen 1 R6?

3. We also have two Pegasus 2 R4 arrays, currently on an older Intel Mac that we plan to migrate to the M1 Mac Mini host. Same questions apply.

Many thanks,

Richard

Pegasus 2 R8 Dead Drive - Log Report

2026-10-19T22:27:49.9270000

Hi,

I have a 24TB Pegasus 2 R8 and one of the 3TB drives just died. I'm running it on a Mac Studio M1 and OS Ventura 13.1.The drive volume is no longer available to view on my Mac but Promise Utility can see it.

I have attached the log report from Promise Ultility. I'm trying to find out how best to proceed without losing any data.

Any help or guidance greatly appreciated.

Thanks,

Mike

Pegasus M4 – does it work with OS 27

2026-10-16T09:41:58.6170000

Hello,

I have a Pegasus M4 and a Pegasus3 R4 here.

Can I update to the new macOS 27? Will the connection still work after the update? There haven’t been any software or firmware updates for a very long time—are these devices even still supported?

Thanks in advance.

Joerg

Pegasus3 r4 powers off?

2026-10-07T03:23:46.2300000

Hi there, my R4 unit has started powering off. if i remove all drives, it powers on.. no warning lights/ issues.. but if i put any drives back in from a cold start or hot swap it turns off.

HPE DL380 Gen10 not detecting external SAS storage through P408e-p after firmware update

2026-10-02T14:24:58.5230000

Hi everyone,

I’ve been expanding a small lab setup built around an HPE ProLiant DL380 Gen10 and ran into a storage problem that has me questioning whether I’m dealing with firmware, cabling, or a controller compatibility issue.

The server is using a Smart Array P408i-a for the internal drives, while I added a P408e-p in one of the PCIe slots for external SAS storage. The external enclosure contains a mixture of 12G SAS HDDs and a couple of enterprise SSDs.

Everything initially looked normal. iLO reports the PCIe card correctly, the controller appears during POST, and the external drives all spin up. The enclosure also shows healthy status LEDs.

The problem is that SSA does not consistently detect the external drives.

Sometimes the enclosure appears after a cold boot, but after restarting the server it disappears completely. Reseating the SAS cable occasionally brings it back, which originally made me think the cable was bad.

I replaced the cable and moved the controller to another PCIe slot, but the behaviour stayed the same.

What made things more confusing is that this started after I updated the server firmware and Smart Array firmware. I have checked the obvious things such as controller mode, drive firmware, PCIe slot settings, and power to the enclosure.

While comparing the DL380 Gen10 controller and expansion options, I came across this https://ormsystems.com/servers/hpe-servers/hpe-proliant-dl380-gen10-servers-price.html, which confirmed that the platform supports both internal and external Smart Array configurations.

At this point I’m wondering whether I have a firmware mismatch between the P408e-p and the external enclosure, or whether the enclosure expects a different type of SAS HBA/controller.

One other thing I noticed is that the P408e-p gets fairly warm even at idle. The DL380 airflow should normally handle passive cards, but I’m also wondering whether temperature could cause the controller to behave strangely once the server has been running for a while.

Has anyone run into similar intermittent SAS visibility issues with a DL380 Gen10 and an external disk shelf?

Would you troubleshoot the firmware first, or would you start by testing the enclosure with a plain HBA to rule out Smart Array compatibility?

How to register Pegasus3 R4 device

2026-10-02T01:24:57.9400000

How do I register Pegasus3 R4. Promise Utility window shows a message:

Note: If the value for the "Serial Number" is n/a, please look up the Serial Number label under ther Pegasus chassis. The Serial Number should be 12 didgis long.

The utility show columns Alias, Model, Serial Number, CBSN, Registered Status

The Serial Number and Registered Status columns have N/A in them.

I found the label with this number MB4L18421300062 and TLA: 0K000400

I don't see a 12 didget number.

But even if one of these is correct where do I go to register this on your site? I have an account. The utility says to go to support.promise.com but that page doesn't show a register a device.

R6 connection to 2026 Studio OS27

2026-09-25T13:58:12.7370000

Any tips on migrating a Pegasus R6, currently tethered to an old Mac Air, to a new Mac Studio? I have the thunderbolt 2-3 converter at the ready but I'm unclear about the steps to install firmware (5.04? available for download? installed using the old Mac or the new?) and drivers. If anyone has successfully completed this migration I would be grateful for advice.

macOS27 Compatability

2026-09-15T14:18:02.4070000

Is there any changes needed before upgrading to macOS27 if the R6 & R8 drives are mounting and the promise utitliy (4.06.0000.04) is working on M1 system running macOS26.7?

Pegasus R4 on M4 mac mini help needed

2026-09-07T19:16:30.9370000

I have 26.5.2 Tahoe OS and have two other Pegasus RAIDs (3 R4 and a 32 R4) connecting with no issue. I have a Pegasus R4 that will connect for a short time then drop. No sleep mode. No reason is apparent when the R4 drops.

I snapped a pic of the current firmware on the R4 is= 5.04.0000.64

the other two are 6.06.0000.45

I feel certain this can be resolved. I am not sure what I have done that might be the issue. TYIA

macos Sequioa + Pegasus2 R8 + Pegasus R6

2026-08-29T16:57:33.8070000

Hi,

I'm once more struggling with getting Promise Utility to show.

What I have:
- macOS Monterey => Pegasus Utility working and showing
- macOS Sequioa => Pegasus Utility installed, settings window showing - Pegasus showing in Finder - but no further window showing, no way to configure anything?
- Pegasus2 R8
- Pegasus R6

I have installed Promise Utility version
- 4.06.0000.01 (C02) (I believe this was advised to be able to install firmware updates)
- Pro Utility 23.4.1

What does not seem to work:
- The Promise Utility seems to disappear off screen. (I have dual monitors) => closing the app and restarting it, makes it visible again
- The utility settings implies the use of a port 8080
Hence I assume it would be showing up on http://localhost:8080 - but it doesn't..

What I'd like to achieve: (=> this is solved by connecting the R6 to a machine running Monterey - unable to do this on Sequioa)
The R6 came with 2 partitions (from its previous owner) (solved)
I'd like to repartition these to a single partition.

I seem to remember, that in the past, I was able to get some Promise application window where I was able to change settings from a.o. the buzzer, beeps etc. And I can't seem to find these again? (found these in the mean time)

Thanks for helping out!

2026-08-29 20:55:25 update
In the mean time I've been able to check on an other system (still running Monterey), there the Promise Utility is still operating.

I have also removed the partitions and reformated to a single new partition, but it seems I have only half of my hard drive capacity available. This makes me think the R6 is on a raid level that causes this. (solved => changed RAID settings)

I also updated the utility to 4.06.0000.04 (C04), but I'm still unable to see the administration utility (on Sequoia)?

2026-08-30 17:26:26 update

Ok, my story continues:
In the mean time I'v been able to use the Pegasus Promise utility on macOS Monterey. (I've added and adjusted my post accordingly, see above)
On my Sequioa (Intel) machine, the Pegasus shows in the Finder, but the Pegasus Utility only shows the Settings window, so no configuration of the Pegasus can be done, no devices show up.

I've done more searching and it might be that I need to install the DEXT driver on my Sequoia machine?
But I would like to get some confirmation here on the forum that the DEXT driver is also suitable for Intel mac's?
Is the DEXT driver also suitable for Intel Macs? link

Thanks for helping out!

How can I recover a degraded RAID array without losing data?

2026-08-25T00:16:50.2100000

Hi Promise

I have a PROMISE RAID system with a degraded array. What is the recommended procedure to identify the failed drive, replace it, and rebuild the array safely without risking data loss? Is there anything I should avoid doing before starting the rebuild? I'm sorry if this is the wrong product category. We're using it in Switzerland so I'm not sure if the process is different.

Regards from Neuchâtel,
Frank
CTO DFA

Pegasus32 R6 suddenly powers off / abnormal shutdown – possible Thunderbolt or power issue

2026-08-07T07:46:29.0770000

Hi everyone,

I am experiencing a strange intermittent issue with a Promise Pegasus32 R6 connected via Thunderbolt 3 to a Mac mini running macOS Tahoe 26.2.

The Pegasus occasionally shuts down very suddenly while the Mac itself continues running normally.

Most importantly, I was able to verify the shutdown on a security camera recording of the server room. The video clearly shows that the Pegasus is operating normally, with disk activity LEDs flashing shortly before the incident. Then, from one second to the next, ALL LEDs on the Pegasus go out simultaneously, including the power-button LED.

There is no gradual shutdown and no indication that only the Thunderbolt connection is lost. Visually, it looks exactly as if someone had suddenly pulled the power plug from the Pegasus.

The Mac mini itself remains powered on and running during the entire event.

The Pegasus is located in an air-conditioned server room at approximately 20°C, so an external overheating problem seems unlikely.

After restarting the Pegasus I generated a Promise Service Report. The RAID itself looks healthy:

- Overall RAID status: OK

- RAID5, 5 x Toshiba MG10 8 TB

- 1 x Toshiba MG10 8 TB global spare

- All six physical drives: OK

- SMART health: OK

- No read/write errors reported

- No bad blocks reported

- PSU status: "Powered On and Functional"

- Fan: Functional

- Controller temperature: 60°C

- Enclosure temperature: 40°C

- 3.3 V / 5 V / 12 V sensors: Operational

The interesting part is the Promise event log. After the most recent incident it reports:

Aug 5, 2026 18:16:11 – Warning – "Last shutdown is abnormal"

followed a few seconds later by:

Aug 5, 2026 18:16:16 – "The system is started (Thunderbolt)"

There is no normal shutdown, host shutdown, host restart or host unplug event immediately before this abnormal shutdown.

Older entries show that the Pegasus is normally able to distinguish between events such as:

- "The system is stopped by host shutdown"

- "The system is stopped by host restart"

- "The system is stopped by host unplug"

This makes the "Last shutdown is abnormal" entry particularly interesting.

I also checked the macOS logs around the event. The Promise DriverKit extension does not appear to crash. macOS reports the Promise device disappearing from the Thunderbolt/PCIe connection, the volume being unmounted, and the Promise driver subsequently terminating normally. When the Pegasus becomes available again, the driver is loaded again. macOS also reports 0 crashes for the Promise driver.

The Mac itself remained powered on throughout the incident.

The Pegasus is currently connected to an APC Back-UPS Pro 900VA, which macOS recognizes correctly via USB. The UPS reported normal AC operation when checked.

As a first troubleshooting step I have now ordered a genuine Apple Thunderbolt 3 cable to rule out the existing Thunderbolt cable.

My main question is:

Has anyone seen a Pegasus32 R6 behave like this – suddenly and completely losing power, with all LEDs including the power-button LED going dark, and subsequently logging "Last shutdown is abnormal"?

Could a Thunderbolt link/cable/controller problem actually cause the Pegasus32 itself to completely power off like this?

Or does the fact that ALL LEDs, including the power LED, disappear instantaneously point more strongly towards an internal PSU/power circuitry problem, or possibly an issue with the external UPS/power supply?

I have the Promise Service Report and can provide additional macOS log excerpts if useful.

Any experience with similar failures would be greatly appreciated.

Pegasus 2 R8 bad drive - rebuild on hour 36 and no progress bar

2026-08-02T13:36:49.3430000

Hi, I had a drive go bad in my Pegasus2 R8 and replaced the drive and began to rebuild. No progress bar ever showed up and the new drive is fast flashing orange. I'm in about hour 36 and it looks like nothing is happening but it does say Critical, Rebuilding under the Operationsl Status of the Logical Drive. I am wondering if there is something wrong with the replacement drive and if I can put a different one in and try again. The new drive doesn't show up in the list of physical drives (it did before I began to rebuild).

My new Pegasus 32 R8 is not powering up

2026-07-25T17:37:10.9470000

Just received my R8 yesterday and it does not seem to power up. I've plugged it in directly to the wall, into my UPS, swapped the power cable.

I've attached it to my thunderbolt ports with different cables (I know the ports work because I had a Terramaster D4 attached to it).

I've even tried using a USB A->C cable and plugging it into the appropriate port on the unit.

I do see a little green glow of an LED inside the unit.

Is there something I'm missing in this setup? Or is this DOA?

Pegasus2 R8 only sees top 4 drives

2026-07-22T02:49:01.3870000

Hi,

I have a Pegasus2 R8 that only sees the top 4 disks.

Let me explain the situation a bit.
I got it for a very low price on eBay with drives in it. It arrived a few days ago and it wasn't the best packaging. The 120mm fan got ripped into pices and the drive bays got a bit of beating causing the front parly ripped off. So I assume there has been some damaged done to the inners of the Pegasus.
Looking at the logs on the device, it was switched off for some years already so not clear how long that issue presist.

I do have another Pegasus2 R8, so I was able to do some testing of the drives and they turned out to be fine.
I also manage to update the firmware to 5.04.0000.61 (which is the same as on my other unit).

I already tried to do the factory reset in the Promise Utility. All successfull, but no change in the situation. Neither did it make any change to hook it up to an old macOS 10.15 host (normal host would be a macOS 26).

A quick look that i had on the inside, looks overall fine to me. I took the unit apart to remove the last few loose plastic pices and to give it a bit of a cleaning on the inside. Which also gave me the impression that someone else was in there before.

Interesting is that the blue LEDs work on all bays and when I did the firmware update, I also had the amber flashing.
Finnaly when I insert a drive in one of the lower 4 bays, I can hear it spinning up.

So my current situation is that the fan is disconnected (replacement is on the way) and I could start swapping pieces from my good R8 into this one, but somehow I am not really willing to do that right now.

It feels a bit like some issue with the back panel to me.
If it would be the power brick, I would expect that the unit should be able to see drives if i just put one drive into the affected bays, but it doesn't.

So open for any idea :-)

CU Florian

Rebuild taking forever.

2026-07-12T08:16:01.8670000

I have an 18tb Pegasus 2 R8 and one of the drives died. I replaced it and hit rebuild. 48hrs later it was at 2%. Left it another 5 days and it never moved past 2%

I checked Events and it says the drives are Idle as well as saying the Power Saving mode of the Physical Drive is changed to STOPPED. It says this for both my replacement drive and the spare drive PD 6 and PD 7 in my system.

I searched further and I now have an error of PD 4 for a bad sector that was registered straight after I replaced the dead physical drive.

I paused and then restarted the rebuild and it now says 0% - Running

Is there a way to force the rebuild or have I lost everything?

Visibility issues between ProLiant DL380P and VTrak expansion – SAS handshaking trouble?

2026-07-08T13:08:08.7670000

Hey everyone,

I’ve finally decided to stop lurking and actually post. I’ve been building out a home lab over the last few months, and while it’s been a great learning experience, I’ve hit a bit of a wall with my storage expansion.

To give you some context on the setup: I’m currently running a refurbished ProLiant DL380P (Gen8). It’s not a speed demon by modern standards—it’s equipped with a single Hexa Core 2.0GHz Xeon —but for my needs, which are mostly local file backups and running a few lightweight VMs, it’s a total workhorse. I love the industrial build quality of these older servers; there’s something incredibly satisfying about the "clunk" of a drive tray sliding into place that you just don't get with consumer-grade plastic towers.

My personal insight from this journey is that enterprise gear is both a blessing and a curse. It's built to last forever, but it can be incredibly finicky when you try to mix and match different generations or brands. My current headache involves trying to daisy-chain an older VTrak series expansion chassis to the ProLiant via an external SAS HBA.

Specifically, I’m running into a point of failure regarding LUN mapping visibility. I can see the HBA is active in the ProLiant’s POST sequence, and the green lights on the expansion unit indicate that the drives are spinning up and healthy. However, once I get into the management interface, the server just refuses to acknowledge the logical drives I’ve configured on the storage array. It’s like they are speaking two different dialects of the same language.

I’ve tried swapping out the SFF-8088 cables and even tried a different PCIe slot on the DL380P, thinking it might be a lane-sharing issue with the Xeon's limited PCIe count on this specific low-clocked model, but no luck so far. I suspect there might be a firmware mismatch or perhaps a specific setting in the storage subsystem that I’m overlooking that’s preventing the "handshake" from completing.

Has anyone here had success bridging the gap between older HP rack gear and these dedicated storage subsystems? I'm curious if I need to hunt down a very specific driver version for an older OS, or if there’s a known compatibility quirk with the Gen8 backplanes and external arrays.

I’m starting to wonder if the 2.0GHz Xeon is actually struggling with the overhead of the management software, or if that’s just my frustration talking. Do you think the issue is more likely at the physical layer of the SAS controller, or should I be digging deeper into the subsystem’s internal configuration?

Looking forward to any advice you can spare!

Pegasus2 R6 Thunderbolt - two drives offline

2026-06-26T14:25:13.2070000

Hi all,

We are having some issues with our Pegasus2 R6, we noticed one of the drives had a red light about 2 weeks ago and were unsure of what to do so we did the worst - we left it and hoped for the best.

Just today, we noticed the fans were whirring at a high rate (probably due to the UK heatwave), so we took one of the drives out to dust it off and forgot to eject it properly, so it was force ejected.

Now we have two drives with red lights and no access to any of our files. Is there any hope for us?

I'll attach an image of the terminal phydrv as per advice from Frank Bosma on a different thread, but we are concerned as he mentioned that not a lot of time should have elapsed between the drives going down to force them back online. We do not want to lose our files!

Please help. Thank you!

Beth

Notification Erreur d'éjection du disque avec Mac Pro 2013

2026-06-25T13:48:41.0970000

Lors de la mise en veille de mon Mac Pro 2013, mon Pegasus2 R4 s’éteint bien; précisément il s'éteint puis se r’allume après quelques secondes et s'éteint à nouveau. Au réveil du Mac, le Finder affiche 8 messages d’erreur : « Erreur d'éjection du disque…» (2 par disques!). Et retour des disques après 30 secondes. En laissant la veille du Mac sur plus d’une heure, je me retrouve avec 72 notifications !!! 2 autres détenteurs de ce boitier utilisé sur Mac Pro 2013 ont ce même problème et comme moi, aucun problème avec les MacBook Pro ou Mac mini. Apple me renvoi sur le support Promise ! Ce problème est-il reconnu et réglé ?

When putting my Mac Pro 2013 to sleep, my Pegasus2 R4 shuts down fine; precisely it turns off then turns back on after a few seconds and turns off again. When the Mac wakes up, the Finder displays 8 error messages: “Disk eject error…” (2 per disk!). And discs return after 30 seconds. By leaving the Mac on standby for more than an hour, I end up with 72 notifications!!! 2 other owners of this case used on Mac Pro 2013 have this same problem and like me, no problem with the MacBook Pro or Mac mini. Apple sends me to Promise support! Is this problem recognized and resolved?

Pegasus R6 not recognized by M5 MacBook running Tahoe 26.5.1

2026-06-24T15:12:36.5300000

My old Pegasus R6 tower will not mount on my new M5 MacBook Pro running Tahoe 26.5.1

It connects fine on a Sequoia 15.0.1 iMac we have

I installed the latest appliciable driver listed on the site which (was pretty old...)

R_MacDrv_V6.2.9

It states it is for Mac OS X 10.12 or later

I have not updated the Firmware yet, but as mentioned it operates fine on a 2019 iMac running Sequoia

No success so far

Disk offline

2026-06-22T10:07:24.1470000

One of my Pegasus R16 hard drives has a problem; when I tried to fix it, the entire volume went offline. How can I resolve this?

Pegasus M4 randomly powering off occasionally

2026-06-21T04:04:59.2430000

I have a M4 Mac Mini video camera server connected to a Pegasus M4. Every 2 or 3 months or so, the Pegasus randomly powers off, making the software relying on it unhappy.

After I eventually discover the problem, I need to go to the unit and manually push the power button to get the disk array back on - which is particularly painful as I am frequently out of town - and count on these servers running withouth manual intervention. The power-off isn't super frequent - once every couple or 3 months - which I might not even notice if I were just using it for desktop operations.

I was hoping to move more services off of an even older Mac Mini server connected to an ancient Drobo Mini, but I afraid to do so, as it seems that ancient set up may be more reliable at this point.

Is this a common problem, or do I just have a bad unit? Is there a way for the disk array to at least auto-power on after it has shut down like that?

A painful lesson: I may have DESTROYED my own Pegasus RAID system

2026-06-20T06:13:43.9670000

Hi everyone,

I just wanted to share a personal experience that happened to me recently, hoping it may help someone avoid the same mistake.

I recently bought a 320W replacement power supply for my Promise Pegasus3 from KDMpower on eBay. I was honestly very excited because my Pegasus unit had been powered off for a while (due to power supply failure), and I was looking forward to finally bringing it back to life.

Unfortunately, the worst possible thing happened.

I did not realize that this replacement power supply has a small but very important switch on the back to select the input voltage: 110V or 230V. I assumed it would work like the original Promise power supply, which does not have this kind of switch. Because of that, I plugged it directly into my 220V power source without noticing that the replacement unit was set to 110V by default.

As soon as I powered it on, I heard a loud “pop pop” sound, followed by smoke coming from the drive system.

It was honestly terrifying.

At this point, I still do not know exactly what was damaged. I am hoping that only the power supply was burned, but I am also worried that something else inside the Pegasus unit — or even the drives — may have been affected. For anyone who stores important data on a RAID system, you probably understand how scary that moment feels.

I want to be very clear: I am not writing this to blame the seller or the manufacturer. This was partly my mistake because I did not check carefully enough before plugging it in.

But at the same time, I think this is something that should be made much more obvious to buyers. Not everyone is an electrician or a technical expert. Some of us are just regular users trying to replace a failed power supply and get our system running again. I honestly did not even know this kind of voltage switch existed until the problem happened.

So my advice is simple:

Before using any replacement power supply, especially one bought from a third-party seller, please check whether it has a 110V / 230V input voltage selector. Do not assume it works the same way as the original part.

If you are in a 220V / 230V country and the power supply is set to 110V, plugging it in directly can cause serious damage instantly.

Now, I really need some advice from a technician or electrical expert here.

I honestly do not know what may have happened to my system. Is there a chance that the mainboard of the Pegasus enclosure was damaged? Could the hard drives themselves also be affected, or is it more likely that only the power supply failed?

What should I do next? Should I try buying another replacement power supply and test it again, or should I avoid powering the unit on completely until it has been inspected by someone qualified?

I am quite confused and worried at the moment, so I would really appreciate any guidance from anyone who has experience with this kind of issue.

Thank you so much for your help.

Utility Pro Software Question

2026-06-17T15:17:09.6170000

Where can I change the stripe and sector with in the Utility Pro for my Logical Drivers to make certain adjustments. I might be missing this but when I goto make a LD, it just sets it to a default.

Thanks

Jon

Another Pegasus 2 R4 question

2026-06-15T21:50:42.8070000

I have a Pegasus2 R4 and wonder if there is a newer version of the Promise Utility that doesn't use Kernel Extentions but rather DEXT. OSX keeps warnning me that Promise Utility uses legacy that will not be supported in future versions of OSX.

Right now the Utility is version 4.06.0000.04 (C04) from 2022.

thanks

Will Pegasus2 R4 work with MacOS 27?

2026-06-11T15:15:03.6870000

Will Pegasus2 R4 work with MacOS 27 i.e. Golden Gate? I currently have an iMac 27" 2020 and it's working fine. I will be upgrading later this year to a Mac Studio.

Long Shot, But trying to see why I am experiencing slow downs on Pegasus32 and Browser Crashes

2026-06-11T01:52:18.3100000

Ever sence moving from Intel Mac to Mac Studios I have run into some interesting issues that I have been unable to solve.

1. Speeds on Promise Pegasus32 R6 have been subpar based on the TB3 standard from what I can really gather. I at best see around 550 - 800MB/s Writes and 450 - 750MB/s Read. I almost see these similar speeds with USB-C 10Gbps. I have tried numerous cables (active and passive).

2. And this is a extremely weird one. (Don't have this at all when using USB-C Drives Directly) When attempting to write files to the PP32 from lets say chrome or safari, it will just end up circle of death and crash the browsers to halt, then I have to force quit, but after that I must reboot as it will just happening again sooner and sooner.

I have been able to replicate this by saving indivdual files, like photos, one after another and then it will cause the halt, this could freeze the browser for 2 - 10 mins then maybe I will be able to save again to the PP32 for a few more times before it happens again and must reboot.

One thing I do notice is that the process of "Open and Save Panel Service" for lets say google does fail and error out, but it seems like the system is either way too fast and cannot catch up or extremely slow.

I have seen some talk about "If a RAID volume has a 16kB stripe size, it is known to cause kernel panics on M-series chips. You may need to back up your data and reformat the array using a 64kB stripe unit size (or convert to a RAID 4/5)" and wonder if there is something here on my end.

I know its a long shot and a lot there, but I have been at this for a long time trying to figure this out, from M1 to M4, just seems I am having issues directly with Pegasus in general and its not happy with Apple Silicone. (Purchased a new M4 fresh out of box thinking it would solve issues and its the same thing.)

Update: as of writting this, I tested brand new TB4/5 Active cables and saw same read and write speeds above. Randomly grabbed a passive TB4 Cable and seeing speeds now reach 1100-MB/s Read and 770MB/s Write which seems to be more aligned with expectations for TB3 and RAID5. Not sure why the actives are reverting to USB speeds as the run is over 3 meters, but it is interesting.

1 Battery(ies) Not Present (Enclosure 1 Battery 2 Not Present)

2026-06-06T14:06:31.6670000

I recently have encountered a controller failure on our D5800f.

I have shutdown the subsystem, removed the failed controller and restarted. So now we are running as as single controller subsystem. Subsystem health is reporting a warning as noted in the title. Why is it reporting a battery missing for battery 2 when there is only 1 battery in the configuration?

Is there a way to clear this warning from the enclosure?

Second and more importantly, is there a service to repair a failed controller or where can I get a replacement controller?

Dean

RAID not mounting

2026-06-03T06:07:06.5570000

Hello

I have a Pegasus 2 R4, its been great for many years.

Recently upgreaded to a MacBook Pro M5 with Tahoe 26.4

The RAID no longer mounts, Ive downloaded and installed Pegasus DEXT Driver V21.1.0, but am having issues with permissions. Any help appreciated and apolgies if this question has been posed previously

Pegasus 2 R4 not mounting

2026-05-17T17:45:02.9800000

Pegasus 2 R4 1010 or before version. Will not mount on iMac 15.7.3. Pegasus is on and blue light lit and plugged in with cable I've used.

Drives failing and blue lights

2026-05-11T02:13:53.7130000

This four year old Pegasus 32 drive has been perfect up until yesterday.

Now when i turn it on only the top four drives have both blue lights on, the second four drives have only one blue light on. The power button stays red and the iMac Pro doesn't see the drive at all.

The drive is connected to an iMac Pro 2018 running OS 15.6.1 Sequoia. I've run Promise Utility (new and old) Disk Utility, Disk Warrior and Disk Drill and none of them see it. Ive changed cables and cleaned all ports.

I would normaly assume drive failure but I find it hard believe four drives would all die on the same day?

It was set up Raid 0 - as recommended for my use.

Would anyone have any suggestions? I am at the end of my diagnostic capabilities. Any help would be more than welcome. Thanks

Seagate Nytro 2532 Series

2026-05-07T17:23:40.6670000

Are the Seagate Nytro 2532 Series SSD drives supported in the VTrak D5000 family?

Seagate Nytro 2532 3.84TB XS3840LE70124 SAS 12Gb/s 3D eTLC 3 DWPD 2.5" SSD

Octet Pro Disk Cloning unit - software needed

2026-05-04T18:34:36.3570000

Long shot - but I'm looking for software for the 90s-era Octet Pro IDE disk cloning unit.

Possibly on 3.5" floppy - I didn't notice any other storage or firmware the unit would boot from.

It's a neat vintage box - fairly standard 486 mainboard with 2x BIOS-less PCI IDE controllers.

An ISA card that controls a 8-disk backplane, looks like it could control power to each drive.

Thanks!

Matt

Intergalactic Microsystems

Raid Compatability

2026-04-29T11:35:03.8970000

I was recently forced into purchasing a VTRAK D5800 since the E5800 became EOL. I had a raid drive set which was created in the E5800. When I installed the drives into the D5800, the pool was recognized, but "Missing", and the size was 11PB, and controller affinity set to "0". I was unable to import the existing RAID.

My question is 1) Should I have been able to import and use the RAID? 2) If I create a Raid on the D5800, can I move the drives to the E5800?

Thanks,

Promise FasTrak TX2650 / TX4650 on fnos(debian) Drivers

2026-04-26T18:05:12.5970000

Promise FasTrak TX2650 / TX4650 on fnos(debian) Drivers

release a driver that can be used on fnOS please!!!

Mounting Issues - Promise Pegasus 32 R4 to a M1 Macbook Pro

2026-04-15T18:31:35.7000000

Hi there

I am havina problem with my Pegasus 32 R4. When I plug it into my Mac using the Thunderbolt 3 cable, all the blue lights come on and the Pegasus 32 R4 is whirring to show that it is working. However, when I look in Finder, there is no sign of it and no sign of it in the disk utility either. Please help!

R4i LUN geometry shift corrupting APFS superblock — anyone seen this?

2026-04-08T07:52:32.6870000

Pegasus R4i — APFS container corrupt, no valid checkpoint

I have a Pegasus R4i MPX module in a 2019 Mac Pro. The RAID array shows healthy in Promise Utility and macOS can see the physical disk (32TB), but the APFS container is corrupt and the volume won't mount.

Running fsck_apfs -n returns:

nx_block_count is 7813423094, while device block count is 7813417974
error: object (oid 0x1): o_cksum is invalid for object
error: no valid checkpoint

All 300+ APFS checkpoints disagree with block 0, so there's nothing for fsck to roll back to.

The block count mismatch is interesting — the container thinks it's ~20MB larger than the actual device. This makes me wonder whether a RAID event or firmware update at some point caused the LUN geometry to shift slightly, which then corrupted the superblock when APFS next wrote to it.

A few questions for anyone who's seen this:

Is there a known issue with the R4i where a RAID rebuild or firmware update can cause a LUN geometry change that results in this kind of APFS superblock corruption?
Does Promise Utility have any low-level diagnostic capability relevant here?
Any R4i-specific recovery path I may have missed before I resort to an erase?

Thanks

Mounting legacy Pegasus issue...

2026-04-05T17:32:19.1900000

I have an old iMac that end of lifed, attached to it I have a Pegasus R6 (TB1) that I now need to get some media/files off of.

No worries, i have an iMac pro at work (with a Pegasus3 R6) I have the adaptor cable, jam it in the back of the iMac Pro and off I go.

Well...it doesnt mount properly, I can see both Pegasus in Disk Utilities but only the P3 mounts properly...meaning icon on the desk top.

I did try the Dext Driver...though i know that probably wouldn't work...and it didn't, so I'm kinda stuck.

If anyone can offer some advice as to how I can mount the old Pegasus would be great...not life or death, just need to get at some old files.

Pegasus 2 logic drive disappeared... possible 2 logical drives???

2026-04-04T06:59:24.8400000

Hi there,

I realised that i had a bunch of files disapear so ran some disc recorery software and found the files were still on the raid, but then I noticed that there looked like there were 2 logical drives?

I ve booted but not both logic drives seem to be offline, and 1 drive had a red light.

I replaced the drive with the red light, but no luck. unless the logic drive is solved it wont let me re build.

critcle events says "missing pd" but i cant find anything to do with missing pd on this site? log attatched.

NS4600 - Unknown IP Address

2026-04-01T19:45:35.7500000

I have 2 SmartStor NS4600s (+ a number of NS4300Ns). After a power outage, one of the NS4600s appears to have booted successfully according to it's lights but the SmartNavi indication shows an unknown IP address so I cnn no longer connect to it or use the PASM interface. HELP anyone?

Expand Pegasus3 r4 storage

2026-03-25T20:55:28.8470000

Wondering how to expand the storage. If I put 8tb drives in x 4.. when I go to migration using the old utility, it shows a max of 9tb. Is there a way to change to higher?

Pegasus R4 connect with MacBook Pro Nov 2023

2026-03-15T10:09:59.4800000

I haven't used my Pegasus R4 for a while, and the Utility management does not support my new MacBook. Where can I find the compatible version of Promise Utility Pro and connect to my MacBook?

Thanks.

Fred

Looking for an empty cage for R6

2026-03-13T13:42:45.0030000

Hi does anyone have an empty cage for an R6?

Logical drive has been set to critical

2026-03-10T21:01:04.3230000

Hi all, I have a solid orange light on the power button. Using the Promise utility, it is saying "Logical drive has been set to critical". is this recoverable?

i am backing up what I can before it dies.. not sure if things will be corrupted as they get pulled off.

How long does a FW upgrade take?

2026-03-09T19:11:39.5730000

Promise utility suggested I upgrade my firmware from 5.04.0000.18 to 5.04.0000.64 on my R4. I've been on the "Please wait. Firmware update in progress..." screen for upwards of 30 minutes and all four drives are flashing activity non stop. Is this normal? If not, what do I do now?

Thanks

Quick thank you to the Promise team

2026-03-02T16:07:42.2900000

Good afternoon everybody. I will keep this brief, but I wanted to make an account to give a thank you to the Pegasus team, particularly Babatunde Akinkuolie for the excellent, thorough documentation on the knowledge base site for legacy Pegasus products, particularly here and here.

I have been a long-time Pegasus user, and still have my original Pegasus R4 from over a decade ago. While my wife and I were decluttering the house, I stumbled across the R4 and decided to see if I could use it as a secondary backup solution. I installed a couple of spare drives I had, and managed to scrounge up a Thunderbolt 2 cable and adapter to use with my M4 Mac. Using the Promise KB articles, I was able to successfully update the firmware on my old Pegasus and was happy to find that it still worked just as well as it had when I bought it back in 2011. I was pleasantly surprised to find that the new Pegasus software is backwards compatible with legacy hardware, and even more happy that Promise maintains documentation for users with legacy hardware.

So glad that the old R4 will have a new life alongside my Pegasus32. Cheers to the Promise team for the excellent documentation and support - you have a loyal customer for life.

Pegasus r4 and Mac Studio - Two drives dead

2026-02-20T15:09:03.3500000

Hello,

I have an old Pegasus R4 unit connected to a Mac Studio. All drives are almost new. Replaced a few months ago after a dead drive problem. Now I have a Raid5 configuration and a few days ago I found my unit with 2 dead drives. I try to attach a few screenshots.

Any suggestion, any hope I can recover my data?

Thank you, Cristiano

Promise Utility Pro Version 24.5.7

2026-02-19T17:47:21.0270000

Hello. How come Promise Utility Pro version 24.5.7 isn't available as a stand-alone download? I get an update prompt through the application but can't find it--or really any mention of it anywhere--on the site. Was it removed because of a problem? Is it a Beta? What's the story?

Thanks.

-Doug

Careful Updating Mac OS to 26.4 (Beta) - R32 "can't repair" Warning

2026-02-19T07:44:04.3870000

Just recently updated to macOS Tahoe 26.4 Beta (25e5207k). After update and reboot, errors popped up "macOS can’t repair the disk “Pegasus32”.

Both my systems can only be read and cannot write, repair or anything at this point.

Might be isolated, but no issues on other systems not on this beta.

Pegasus2 R4 orange power light and not mounting

2026-02-04T04:57:29.5930000

Hi all, I have the Pegasus2 R4 with 4x4TB HDD connected to a MacPro late 2013. My unit was having issues where it would randomly unmount and remount causing multiple "Your disk was not ejected properly" messages. Then several days ago the volume unmounted, the power button light turned orange, and could not be shut down via the, now, orange button. The thunderbolt light is lit and blue, the fan is spinning, all of the drives are showing blue and spinning up when powered/plugged in. Also, on occasion, it causes a kernel panic. The system report shows that it was caused by com.promise.driver.stex. There is no window in the Promise Utility app and all the menu items are greyed out.

Here's what I've tried so far:

Unplugged the unit, waited (up to 24hrs) and plugged it back in
Let it run for 24hrs to see if it would sort itself out
Removed the drives and start up
Tried changing ports both on the Mac and the unit
Checked system info - thunderbolt, and it was listed there, although it showed only as connected upstream
Disk utility
removed and reinstalled com.promise.driver.stex
removed and reinstalled the Promise Utility app
Removed power cable from UPS and tried directly in wall socket
Tried the promiseutil comand line interface (Error (0x4008): subsystem not found)
Fully cleaned dusted the unit
Tried different rebooting orders (mac then unit, etc)
Fully clean and dusted Mac
Reset the SMC
Reset the PRAM/NVRAM
Cleared caches on mac
Ran the maintainance scripts in terminal
Inserting the disks one at a time
Swearing at the unit and callling it names

Thanks in advance for any help or creative suggestions you all can send my way. All of my work is located on those drives and deadlines are looming. If there is something that I've missed (a hidden magic button I can poke with a paperclip would be great) or something I can point to and blame for this. Please let me know.

Cheers!

Pegasus power supply replacement

2026-01-29T18:45:13.9030000

For anyone experiencing a power supply failure in their Pegasus - as I did in my Pegasus32 R4 - after a lot of looking I was able to find yesterday a replacement via eBay from KDM Power in Houston. The unit arived today, install took 10 minutes, and my system is up and running again.

Here is a link to the unit; I found the people at KDM to be very knowledgable, responsive, and helpful:

https://www.ebay.com/itm/336158204663

I have no relationship with KDM aside from being a happy, and relieved, customer.

Pegasus2 R6 Thunderbolt - two drives offline

2026-01-28T02:33:45.5900000

Hello, I was working on an archived video project (approx 15TB). I had an r6 mounted and the footage was all there and available.

Then I unmounted the RAID. I inadvertently popped open two drive draws, forgetting the RAID was still powered on.

Here's the Promise utility screenshot.

As you may be able to see in the above screenshot, two drives are now "offline" and the RAID is degraded and unmountable.

I'm hoping all the data is still on those drives and I can reconstruct the RAID.

Is there a way to get the RAID back into a happy happy state?

If not, is there any hope for data recovery from a third party or is that folly?

Thank you for your thoughts, time and expertise. Bergen.

Pegasus2 R6 not showing in Finder or Disk Utility

2026-01-22T15:22:12.7030000

Hi all,

I need some help here, asap, please.

I have two Pegasus2 R6 connected to my iMac for years without any issue until now. Both are configurated as RAID5 and have always worked fine.

But yesterday, one of them stopped showing in Finder so I can't access the very important data I have in it.

When I try to open Disk Utility, this app hangs on for a long time and nothing happens. Only once it oppenned but the missing drive is not there either.

But if I go to About this Mac>System report>Thunderbolt, the drive is there as usual.

Please keep in mind that I have two identical units daisy chained together and they have allways worked fine. Only one is not showing now.

Some added info:

iMac Retina 5K, end of 2015, 4 GHz Intel Core i7, Catalina

The drive starts up normaly as usual, tho short bips, all leds blue.

I have changed the order between then, disconnected the other one, changed thunderbolt cables, changed thunderbolt ports, tried with another mac, both with Catalina and Mojave, no sucess.

What could be the problem and what can I do to make it appear againg in Finder?

Thanks

Volume quota

2026-01-15T14:22:54.0830000

Hello everyone.

Is there a way to assign a quota to the volume of the NAS Share created?

Assigning a quota to individual users (or all users at once) or user groups isn't very convenient, since the quota is distributed equally among users and groups.

I need to leave 20-25% of the pools free.

There are a lot of users and groups, so calculating individual quotas for individual users and groups is very difficult.

I haven't found a way to implement this by assigning a quota to the NAS Share.

I'd appreciate any help.

Thank you all.

Pegasus 2 R8 does not work on Mac Studio M2 Utility

2026-01-09T19:46:34.9500000

Pegasus 2 R8 does not work on Mac Studio M2 Utility.with OS Tahoe but works on Mac Studio M1 Max.

I´m using the DEXT driver on both Macs. Anyone known with the problem with missing contact between Pegasus 2 R8 and Mac Studio M2 Utility.with OS Tahoe?

Two Pegasus RAIDS on one Mac?

2026-01-06T19:28:50.0770000

Hello,

I have a Mac and a Pegasus2 that are both around 10 years old.

If I purchase a new Pegasus32 can I plug it into the Mac and move all the files over from the old Pegasus2 to the new Pegasus32?

thanks

MAC Mini M1 - Promise Pegasus 2 R6 not visible

2026-01-06T14:42:59.6830000

Hello,

I have a Promise Pegasus 2 R6 connected to a Mac Mini M1 pro using the usb-c - thunderbolt 2 apple adapter.

The dext driver should installed correctly

% systemextensionsctl list | grep promise

* * 268CCUR4WN com.promise.driverkit.pegasus (21.1.0/1) com.promise.driverkit.pegasus [activated enabled]

but the promise is not mounted

% promiseutil

-------------------------------------------------------------

Promise Utility

Version: 4.06.0000.04 Build Date: Mar 28, 2022

-------------------------------------------------------------

List available RAID HBAs and Subsystems

Totally 0 HBA(s) and 0 Subsystem(s)

The thunderbolt cable and adapter is working because I tested it to connect my old Mac Pro with the M1 and it worked without any issue.

All the HD leds are blue, included the one related to the thunderbolt port.
The power led is orange

Could you help me pls?

need both pegasus and pegasuspro drivers? which ones?

2026-01-04T01:38:49.3270000

I have a mix of 3 Pegasus2 R8, 2 Pegasus3 R8, and 1 Pegasus R12 volumes hanging off my Mac Studio. I have both com.promise.driverkit.pegasus.dext version 21.1.0 and com.promise.driverkit.pegasuspro.dext version 22.1.7 installed. The pegasus version at least used to be required for the Pegasus2 and Pegasus3 drives and is the latest version in the Downloads > Drivers section for those models. I believe when I installed the Pegasus 5 it required the pegasuspro driver and (I think) it shipped with this driver version. Disturbingly, the Pegasus R12 is not represented anywhere in Current Products and the Pegasus5 R12 lists no drivers. And the latest Pegasus Pro driver listed is 22.0.2. My 22.1.7 isn't listed anywhere I could find from the GUI, though it is findable using Google's site: functionality.

My main question is: Do I really require both pegasus and pegasuspro drivers? Note that the older Promise Utility.app shows only the Pegasus2 and Pegasus3 drives, not the R12, whereas the PROMISE Utility Pro.app shows all of the drives.

My secondary question is: How can I determine the latest driver for the Pegasus R12 and where can I download it? Despite being just barely over 1 year old Promise seems to have abandoned it for the Pegasus5 R12. (Yeah, I wish I'd waited.)

The motivation for investigating this is that one of my Pegasus2 drives has been dropping offline suddenly, for no reason I can discern, and I thought maybe, just maybe having two promise drivers could cause some issues.

Pegasus2 R6 One disk has a red light

2025-12-27T20:37:56.9300000

On my ancient Pegasus2 R6 system, one of the disks has developed a red light.

I have completely forgot everything about system maintenance on this program.

I have just reinstalled the Promise Utility program (4.06.0000.04 (C04). But that seems to just run a program called Instruments. I vaguelly recollect a function to check the disk status on ths program.

How do I fix the red light issue?

Pegasus 32 will not mount after upgrading to MacOS 26.2 for M1 iMac

2025-12-21T20:53:04.6630000

I had MacOS 26 and 26.1 and the Pegasus32 was working perfectly. I just upgraded two nights to 26.2 and now the Pegasus will not mount.

I ran the terminal command - systemextensionsctl list | grep promise and get driver 21.1.0 and says its activated and waiting for user.

I checked system information and I can see Pegasus32 under Thunderbolt USB bus 0 and says device is connected. I go to disc utility and nothing. I wanted to downgrade back to 26.1 but guess what, all my backups are on the promise array so I can only see the last 24 hours which is all 26.2. Please help as not only do I not have backups but I also have over 4 terabytes of videos and pictures that I cannot access.

I have restarted 3 times. I have manually shut down and unplugged unit and waited a few minutes and then restarted, still nothing. I have plugged and unplugged the thunderbolt cable, which from above I know is working since it can be found. Also based on your download page I know I have latest version of Promise Pro Utility and would assume I have latest version of drivers installed as I have a M1 iMac as I stated, it was working with 26.0 and 26.1. But I have not tried to uninstall or reinstall drivers yet.

Please help?!?

Reformat Pegasus3 R6

2025-12-17T21:47:09.2300000

How or where would one find instructions on how to reformat a Pegasus3 R6. I'm running into issues with my editing/compositing app not getting along with the Pegasus (based on the logs from my editing app) So...I would like to start from scratch from the array end of things.

I've backed up all the data on the Pegasus just can't see a way to reformat via the new(ish) Utility tool.

Any advice would be appreciated.

SSD Wizard Configuration

2025-12-15T13:34:05.1370000

Hello, I am planning to upgrade my Pegasus32 R4 with SSD drives.

I was wondering if there are any special considerations to take into account when configuring the disk array and logical drive, or any recommended parameters for using the enclosure with SSDs.

I am also wondering if it is necessary to enable a TRIM function in some way, or if everything is handled automatically.

My operating system is Mac OS Sonoma.

Pegasus2 R6 forced in "Read Only Mode"

2025-12-14T16:48:53.3870000

I recently had an external SSD (Samsung T7) failure that caused several kernel panics on my MacBook Pro. During that time, macOS set my Pegasus RAID volume to read-only.

I’m using a Pegasus2 R6 connected via Thunderbolt to an Apple Silicon MacBook Pro (macOS 15.x). I checked the SMART logs for all drives and found that the disk in Slot 4 was still online but showed reallocated/unstable sectors, so I treated it as failing.

What I did:

Made a full backup of the Pegasus volume to an external HDD
Hot-swapped the drive in Slot 4 (without powering down the Pegasus)
Inserted a new identical drive, set it to Unconfigured and manually rebuilt the disk array
Rebuild finished successfully, redundancy check and currently running media patrol
In Promise Utility everything is green and all drives report as healthy

However, the RAID is still read-only in macOS, and on every boot I get a message that macOS tried to repair the volume, failed, and therefore mounted it read-only. Disk Utility First Aid on the Pegasus volume also still fails.

My questions:

Is there any Pegasus-side flag or state I need to clear to get out of read-only, or is this purely a filesystem issue on the macOS side now?
Given that I have a full backup: is the recommended / safest solution to delete the logical drive, recreate and reformat the array, then restore from backup?

Any guidance on the proper next step would be very much appreciated.

Looking for Pegasus2 Firmware 5.04.0000.36

2025-12-11T16:32:37.6370000

Apple has declared all my Intel Macs that I connect my Pegasus2 units to are now "vintage" so I have turned to loading Linux on them to maintain security updates and keep the Macs and the Pegasus2 units from the eWaste graveyards.

I have 3 Pegasus2 units:

R8 - firmware 5.04.0000.36 - works with the Linux Kernel STEX driver

R8 - firmware 5.04.0000.64 - does not work reliably with the Linux kernel STEX driver

M4 - firmware 5.04.0000.62 - does not work reliably with the Linux kernel STEX driver

A few years ago I emailed Promise support asking for the 5.04.0000.36 firmware to be made available from the Promise Download Center in their Legacy Products section.

I went back and forth with the Promise tech, but he couldn't seem to grasp why I wanted to load an older firmware onto devices that had newer firmwares. In the end Promise never made the older firmware file available to me via the Download Center or any other mechanism.

So out of desperation, I am posting this to see if there is a community stalwart out there that has archived all their firmware upgrade files, and has a copy of firmware 5.04.0000.36 that could be made available to me.

In case no such stalwart community member exists out there, I will make another appeal to Promise to:

1) make the 5.04.0000.36 driver file available on the Download center, since it works with the latest (quite old) version of the Linux Kernel STEX driver

2) have a developer update the STEX kernel driver to work with the Pegasus2 5.04.0000.64 firmware, since that is the recommended firmware for the Pegasus2 units. I don't think its too much to ask that at least one of the available firmware files for the Pegasus2 be supported in the Linux Kernel STEX driver, if Promise won't make the old firmware file available. 5.04.0000.64 makes sense to be that version since it is currently the latest (and presumably last) version of the Pegasus2 firmware.

In my mind the simplest thing is for Promise to add the requested firmware file to the Download center - I mean what is the downside to that? If someone flashes their Pegasus2 with the old firmware, they can still flash it with the new firmware at a later date (say when they can afford an Apple Silicon Mac).

Chach ssd drives

2025-12-03T11:17:35.9400000

Which SSD drives are compatible with the cache? I want to install four SSD drives and use them for caching. Drives are compatible with the Cache. I want to install the 4 SSD drives and use the cache

R8 Not working after Rebuild and Restart

2025-12-02T14:46:53.0470000

Hello,

I replaced and rebuit a bad brive on my R8 Array. The rebuild was successful. When I restarted the Mac Pro, the Array doesn't mount and I get "The Disk you attached was not readable by this computer" error pop-ups for all 8 disks in the Array, with the options to Eject, Ignore or Initailize. I've also tried different Thunderbolt cables and connecting to another Mac.

The drives do show up in the Promise Utility App but the Disk Array and Logical Drive tabs show no configured drves/arrays.

Can anyone advise on what issue may be and is the data still present on the drives?

Thanks

Pegasus 2 R4 - No longer starts up as expected

2025-11-29T11:05:09.0400000

Pegasus 2 R4 - was working fine until after unmounting and then physically disconnecting the unit from my Mac I noticed it did not go to sleep as expected.

Now when powering on from cold the fan starts up but I do not hear the expected disk chattering that shows the unit is coming to ready.

Unit shows in System Information as connected to Thunderbolt.
System Extension is loaded (com.promise.driverkit.pegasus (21.1.0/1))
promiseutil shows no subsystem available.
Unit does not respond to power button, power cable has to be removed.

This feels like a sudden hardware failure (for whatever reason) but if anyone has any suggestions on how to possibly revive it that would be most welcome.

Thanks.

Mac Studio M4 Max/macOS Tahoe 26.2/Apple Thunderbolt 3 Adaptor/Promise Thunderbolt 2 Cable

Pegasus R4i - using disks in an external device?

2025-11-28T11:32:53.4200000

My MacPro 2019 is going to be sold soon and I was wondering if I could continue using the 4 disks of my Pegasus R4i (RAID 5) in an external device, connected to my new Mac Studio?

Thank you in advance.

Instructions for recovering webpam login account password

2025-11-28T04:35:38.6730000

Hi Team

I forgot the webpam login password of the Vess A6600 device. Please guide me to retrieve this login password.

Many thanks

TRANSLATE with x English TRANSLATE with COPY THE URL BELOW Back EMBED THE SNIPPET BELOW IN YOUR SITE Enable collaborative features and customize widget: Bing Webmaster Portal Back

Reset of Apollo Cloud 2 saying no internet access

2025-11-21T11:27:43.4400000

After resetting the device went green/white awaiting activation. I went through this and got the code sent. I set the new password but on submission it says check your internet access. I can see the Apollo has an IP adderss and I can see it can obviously reach the internet otherwise it would not have requested the code.

Please help.

Pegasus3 R8 will not work on system above Sequoia 15.4.1 mac?

2025-11-18T13:07:50.4970000

Hi! I'm on a Mac OSX M1 Running Sequoia 15.4.1, i get this messeage that if i update the mac my promise no longer will be supported? And i just tried to update and yes no longer can i mount my Pegasus3 R8!

So i had to downgrade to Sequoia 15.4.1 and that did the trick it works again!

BUT what to do when i eventaually do want to upgrade in the future?

Question about installing the cache battery

2025-11-16T07:21:49.9100000

Hello! Initially, 1 controller, 1 cooling unit with a cache battery installed, and 1 cooling unit without a battery were installed in the e610f storage system. Later, a second controller was installed in an empty slot. The question is, is it necessary to install a battery in the cooling unit without a battery, or is it sufficient to have one battery in one of the cooling units?

can't mount Promise Pegasus drive that was working

2025-11-13T22:33:22.8330000

I installed some drivers from the Promise site and just cant mount the Pegasus 3 drive on my M3 Ultra Mac Studio, I can mount SSD drives, USB drives but not the thunderbolt drive. The drive mounts on other macs. Something in installed is messing things up--have tried to uninstall and delete a bunch of files in Terminal and re-install, no luck, I have only one mac that will not mount any HDD based thunderbolt drive, I know my cables are ok, etc. Have booted up in safe mode, etc...I can't see the drive in promise utility, anyone else deal with this?? thanks. It was working and I messed it up installing something.

Sanlink3 F2 cannot be used on the Mac mini of the M4 Pro

2025-11-07T03:31:20.1800000

Consultation question
Does Sanlink3 F2 support the M4 pro chip in the mac mini with the system version macOS Sequoia 15.6.1? After installing the driver, the hardware of Sanlink3 F2 can be recognized in the system, but data transmission cannot be performed after connecting the fiber. The green light keeps flashing, and the yellow light is not on. It has been confirmed that there are no issues with the fiber or the module

Pegasus2 R8 + Mac mini M4, drive disconnects repeatedly

2025-10-28T16:39:26.6930000

Pegasus2 R8 + Mac mini M4 + Apple A1790 Thunderbolt 2 to 3 adapter: when Pegasus2 powers on, drives are mounted normally and I can access the data on the volumes. After waiting (or using the drives) for a while - usually 2-5 minutes - I get OS-level notifications there drives were unmounted abnormally. Similar issue has happened with both macOS Sequoia (initial OS that was installed on Mac mini M4) and macOS Tahoe.

Before Mac mini M4 I had Mac mini M1, and I was able to use Pegasus2 with the same adapter and cable without any issues for many years. I also have a Mac mini 2011, and Pegasus2 works perfectly without the adapter.

Promise Utility's Event log only shows "stopped by host unplug" as if the cable would have been disconnected, so it won't help much with debugging. macOS logs don't show any clear reason for ejection either.

Pegasus2 firmware is 5.04.0000.64 and I also have the latest DEXT driver installed on my Mac mini M4:

systemextensionsctl list | grep promise
com.promise.driverkit.pegasus (21.1.0/1) com.promise.driverkit.pegasus [activated enabled]

Any ideas what could be causing this behaviour or are you maybe having the same issue?

Tahoe updated - Pegasus 2 R6 NOT recognized on Mac M4

2025-10-26T12:26:49.1630000

Hi there, has anybody found how to troubleshoot this issue? My M4 MBP doesn't see the Pegasus 2R6, despite the all the updates downloaded from the promise site. Tks if you can help

Can't access my promise pegasus32 after upgrading to macos Tahoe

2025-10-23T08:36:27.7930000

Hii

i can't access my promise pegasus32 R8 after upgrading to macos tahoe - I have it running on my mavbook pro M1.

Anybody knows what to do ??

Pegasus Gen 1 firmware update, MacOS 10.12.6

2025-10-13T20:18:32.7070000

I have two Pegasus 1 drives set up as RAID5, and would like to update the firmware so that I can run a later operating system, specifically 13.7.8 Ventura. I've read several posts here, and have tried to put together how to do this. I can get the drive to mount using Thunderbolt 2 cables to a MacBook Pro running 10.12.6. I have tried mounting it on an iMac running 10.13.6, it won't mount. I ran the utility on the iMac, and it says the drive has the latest firmware. If there is a post that could walk me through getting the drive to mount on the iMac running 13.7.8, using a Thunderbolt 2 to Thunderbolt 3 cable/USB-C, I'd appreciate the help.

Pegagus2 R4 with USB-3 or USB-C via d-adapter ?

2025-10-09T10:21:38.6430000

Hi,

Got a Pegasus 2 R4 that works fine, but has we change our server (MacOS to Synology NAS) we will not have any thunderbold (TB2) available, only USB-3.2.

Pegasus has been tested through an adaptator TB2 <> USB-C ?

Apple claim it adapter is both way :

https://www.apple.com/fr/shop/product/MYH93ZM/A/adaptateur-thunderbolt-3-usb-c-vers-thunderbolt-2

This has been discussed in 2017, the situation has change ?

Mac Mini M4 with macOS Tahoe and Pegasus2 R4 - will it work?

2025-10-03T18:15:36.8570000

I have a Mac Mini M4 with macOS Sequoia + Pegasus2 R4 on the Apple Thunderbolt adapter. All is working fine. I wish to update my macOS to Tahoe.

Will it work? Has anyone done the test on that configuration?

Vess R2600 - Reset default password

2025-10-03T12:10:23.8370000

How to reset the administrator password of the Vess R2600 series devices to the default password.
(Also confirmed to work on Vess R1840i unit)

Download attached .zip file.
(please make sure to rename the file to "OPAS_vr2k_resetpw.zip", it needs to have only OPAS in capitals, all other characters lower case, it will not work otherwise)

Copy it to the root folder of a FAT32 formatted USB drive.

Power on the Vess device, wait for it to boot up.
Insert the USB drive in the top USB port in the front panel of the device.
The device will start beeping and the LED on the USB slot will blink for a while.
Wait for the process to finish, remove the USB drive, done!
Login with default 'administrator' / 'password'

The USB stick will now contain an extra folder called OPAS_OUTPUT with 2 logfiles.

One servicereport file and a .txt file, the latter should show the password reset process.

Status ist auf offline

2025-10-03T11:33:11.9930000

Plötzlich kann ich seit einer Woche nicht mehr auf meinen Apollo zugreifen. Ich kann den Status Offline nicht wieder auf online setzen.

Wie kann ich das Problem lösen?

Mit freundlichen Grüßen

Pegasus 2R6 does not stay on with thunderbolt convertor.

2025-10-01T21:08:54.0400000

I recently got a new Mac book and it doesn't have any thunderbolt 2 ports on it. So I bought a third party convertor, USB-C to thunderbolt 2, to connect it to my Pegasus 2 R6. However now my Pegasus 2 does not stay on. It tries booting up, it beeps twice then the power light turns oragne and then turns off. I tried using both thunderbolt ports on the Pegasus but still it doesn't stay on.

I heard that I need an offical Apple brand convertor is that true? Is there a way to fix this or am I just unable to us my Pegasus with my new Mac book.

Issue connecting to Apollo Cloud devices

2025-10-01T10:11:21.4100000

An issue has been reported by several customers regarding the Apollo Cloud units.

It is not possible to connect to the devices from external or mobile networks, the units are accessible via local LAN only (reproducable).

Promise engineering team is working on a solution, our apologies for the inconvenience.

Kind regards,
Frank

Get Files from Apollo Cloud 2 Duo

2025-09-30T11:50:33.2570000

I have two Apollo Cloud 2 Duo 8TB hard drives. I would like to get the files from the Apollo hard drives to either a cloud backup or a portable hard drive. Can anyone explain to me how to do this?

Problem with updating the VessRAID 1720i firmware

2025-09-28T10:22:23.7330000

Hello! I'm having trouble updating the firmware on my VessRAID 1720i. I'm trying to download the firmware from the official VessRAID_all_306000010_32mb.img website, but I'm getting errors:

"PTIF: Error OEM code incorrect for this product".

Information about the current firmware:

Vendor : Promise Technology,Inc.

Model : VessRAID 1720i

PartNo : SerialNo : QESY44026655

Revision : A2 WWN : 2000-0001-5561-27b7

ControllerId : 1

BootLoaderVersion : 3.04.2060.04

FirmwareVersion : 2.03.2060.22

SoftwareVersion : 2.03.2060.22

BootLoaderBuildDate : Dec 6, 2013

FirmwareBuildDate : Dec 6, 2013

SoftwareBuildDate : Dec 6, 2013

Pegasus2 R4 Compatible with macOS 26 Tahoe?

2025-09-24T06:56:38.5670000

I have a Pegasus2 R4 connected to a Mac Studio (M1 Ultra). The device is working great on macOS 15.7 (with the DEXT driver installed).

Does anyone know if this will continue to work with macOS 26 Tahoe?

How to configure notification email

2025-09-18T09:14:28.6270000

Dear team

I am trying to set up an email notification on Vess A3340PD devices but failed. Please guide me to do this.

Thanks you

Having Issues Creating Disc Array

2025-09-18T01:35:23.2900000

Has anyone had trouble having the 'start disc array' show up on Promise Utility Pro? I just got all new drives for more capacity on my 32r8, the drives show up but in my Promise Utility Pro I don't see any option to set as a RAID5. I reformatted all the drives for mac and they show up as 'passthrough drives'. Thanks to anyone in advance!

-L

Advice for adding new computer to 2013 R6

2025-09-02T15:16:27.8170000

I have a constantly used R6 bought with, and still used with, a 2013 Mac Pro ("trash can"). The Mac Pro is no longer reliable and I want to buy a new computer easily used with the R6. I was told that the Studio would not work with the old R6. I'm a photographer with limited computer skills ... would it be practical to hook a new Mac Mini to the old R6?

Thanks

Upgraded firmware on Pegasus2 R6, now it won't mount

2025-08-29T00:18:41.3730000

I tried to upgrade my Pegasus2 R6 to the latest firmware, v5.04.0000.64. After restarting the computer the raid is visible in System Report but not in Promise Utility, Disky Utility or on the desktop. What could possibly be the issue?

Im sitting on a Intel Macbook Pro late 2019, macOS Catalina 10.15.4, and Promise Utility 4.06.0000.01

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