Pegasus2 R4 no longer mounting after 2 days use with new synchronised Raid5

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  • Last Post 3 weeks ago
Kristi Drain posted this 3 weeks ago

I replaced all 4 original Toshiba 2TB HDDs with Seagate 4TB Ironwolf Pro, setup as array, Raid5 with 1 logical drive, total 12TB usable. Synchronization took about 20 hours, then I started using it with no problem, editing 4k video, 650MB/s read and write approx. It operated fine from both an M1 Mac Studio and M2 Macbook Air. Then I shut down, moved the drive, reconnected and it no longer mounts, however the Promise Utility sees it fine and says there's no problem.

OSX Disk Utility shows an external drive called "Promise Pegasus2 R4 Media", but says it's "Uninitialized", so it cannot be read, or ejected, and disk first aid takes about 3 seconds and completes fine.

The drives were formatted as APFS. 

I've tried connecting on a Mac Studio M1 running Ventura 13.6.7, a Macbook Air M2 running Ventura 13.5 (both with all appropriate Promise drivers installed, and it worked on both for about 36 hours), plus an Intel based core i7 Imac.

I've tried putting the original 2TB drives back in and they're no problem at all. They mount straight away in their 1 logical drive Raid5 configuration. The old Toshiba drives are dated from March 2014, they're surely getting near the end-of-life, and there's not enough capacity for me.

So I put the new drives back in again and it won't mount - Uninitialized.

I've attached a subsystem report. Please help.

Cheers

Kristi

Attached Files

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Spyrothean Slurry posted this 3 weeks ago

@Escape Road Since your new Seagate drives were working fine initially but are now showing as "Uninitialized," there are a few things you might want to try:

  1. Check RAID Configuration: Sometimes, the RAID configuration can get corrupted. Try checking if the RAID setup is still recognized in the Promise Utility. If necessary, you might need to reinitialize the RAID array, but be cautious as this could lead to data loss.

  2. Firmware Update: Ensure that your Pegasus2 is running the latest firmware. Sometimes, compatibility issues can arise with newer drives, and a firmware update might resolve the mounting problem.

  3. Try a Different Cable/Port: Occasionally, connection issues can cause drives not to mount. Try using a different Thunderbolt cable or port to see if that resolves the issue.

  4. Data Recovery: Since the drives are showing as uninitialized, you might want to consider using data recovery software to see if you can access any data before attempting any further troubleshooting.

  5. Contact Support: If none of the above steps work, reaching out to Promise support with your subsystem report could provide more tailored assistance.

Hopefully, one of these suggestions helps you get your drives up and running again!

 Cheers!

R P posted this 3 weeks ago

Hi Kristi,

On Feb 3rd at 9:33 PM someone ran a quick initialization on the LUN. This will zero out the first 64MB of the disk and that will erase the boot block, the partition table and the filesystem.

-------------------------------------------------------------------------------
SeqNo: 15491                           Device: LD 0
EventId: 0x00080007                    Severity: Info
TimeStamp: Feb 3, 2025 21:33:57        DefaultId: 0x00080007
SpecData: 000000000000000000 0000000000000000 0000000000000000 00000000000000
Description: Quick Logical drive initialization has started

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

This cannot be undone.

To create a new filesystem on the LUN, open Disk Utility, find the LUN named Pegasus and use the 'erase' button at the top of the utility. You then name the disk and select the filesystem type (use HFS+, not APFS).

 

Kristi Drain posted this 3 weeks ago

OK thanks so much R P for responding and checking the subsystem report. Also good to know that APFS is not recommended as a format for this enclosure. I'd better stop tinkering in the Promise Utility, as that was clearly my mistake.

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