Maximum hard drive size for Pegasus

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  • Last Post 11 June 2019
Anders Berner posted this 23 September 2016

I have a Pegasus R6 with 6x6 TB drives i.e. 36 TB. It works perfect. But what is the maximum size for Pegasus R6 and Pegasus R8 (and Pegasus2-series)?

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Venkatachalam Settu posted this 23 September 2016

Hi,

Please use the below link to download the compatibility list for Pegasus series/Pegasus2.

Pegasus R4/R6 Compatibility List:

http://promise.com/DownloadFile.aspx?DownloadFileUID=4127

Pegasus2 R4/R6/R8/M4 Compatibility :

http://promise.com/DownloadFile.aspx?DownloadFileUID=4126

The compatibility sheet has the list of current qualified and supported compatible products. If it is on this list then it has been tested and approved for use. If it is not on this list then it is not officially supported i.e. it has not been tested, it may or may not work.

 

Thanks!

Keirnan Monaghan posted this 24 September 2016

Well according to the list, only 1 6TB drive is supported - and it's only supported for the R8? Thats really awful. This situation is the only reason I don't own a Pegasus2 yet. 

 

 

Pegasus2 R4/R6/R8/M4 Compatibility :

http://promise.com/DownloadFile.aspx?DownloadFileUID=4126

The compatibility sheet has the list of current qualified and supported compatible products. If it is on this list then it has been tested and approved for use. If it is not on this list then it is not officially supported i.e. it has not been tested, it may or may not work.

Dinesh Kannusamy posted this 24 September 2016

Hi,

Yes. The 6TB drives is tested only on the Pegasus2 R8 enclosure. May be there will be an update on compatiblity list with higher capacity drives in the next release. Please check promise.com for updates.

 

Thank you..

Stephane Sednaoui posted this 10 April 2017

Hello Anders, would you mind to tell me which 6T hard drives you are using with your PegasusR6, and if you managed to find higher capacity HD that are compatible ?Much thanks !

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Anders Berner posted this 11 April 2017

Hello Anders, would you mind to tell me which 6T hard drives you are using with your PegasusR6, and if you managed to find higher capacity HD that are compatible ?Much thanks !

 

I am using WD Red disks - 6 TB. Works perfectly with my pretty old Promise R6

Anders Berner posted this 11 April 2017

The specific drives that I use for my Promise R6 (1.st. generation) is WD Red WD60EFRX

Robert Brownlie posted this 09 May 2017

The specific drives that I use for my Promise R6 (1.st. generation) is WD Red WD60EFRX

I also use these drives in my R4 Discless (secound Generation) and they work but the Blackmagic shows them as slower in side the raid 5 then when I connect them individually out side the Promise unit.

I'm thinking of adding Seagate Enterprise drives 8 or 10TB first to my R4 and if they work there then my R6 (1st generation also)

Dan Deal posted this 24 April 2018

link points to Compatibility List v2.1.  Here's current v3.0:

Pegasus2 R4 / R6 / R8 / M4 Compatibility List V3.0 - Promise ...

or google "promise pegasus2 compatibility list"

 

http://promise.com/DownloadFile.aspx?DownloadFileUID=4126

The compatibility sheet has the list of current qualified and supported compatible products. If it is on this list then it has been tested and approved for use. If it is not on this list then it is not officially supported i.e. it has not been tested, it may or may not work.

Thanks!

Roland Rick posted this 04 April 2019

Hi Anders

I also have a Pegasus (no 2, 3, etc) R6 and loaded them with the (as far as I can remember) official max of 2 TB disks.

Don't you face any problems with the 6 TB disk. My config is a RAID 5 Array with 1 partity disks and 1 spare disks. So, currently I have 8 GB net.

No problems to exceed the 2 TB limit?

For any reply, many thanks in advance!

Cheers, Roland

Ian Bell posted this 05 June 2019

I've got an original Pegasus R6, and I find it to be quite tolerant of various drives. I'm currently running (6) 5TB Seagate ST5000DM000-1FK1 drives that I shucked from a bunch of ultra low-cost backup drives that were on sale on eBay. They've been up 24/7 since mid-2015. They're running as RAID 5 to deliver 25TB. I find the slower speed (5900RPM) of these green-ish drives is not a big deal in that configuration... they're likely bottlenecked at the Thunderbolt wire speed anyway, but for my application (streaming video) it's totally acceptable performance and they do not throw a lot of heat or suck too much power.

I came here because I'm wondering what the theoretical maximum volume per head (and overall volume) on a Promise Pegasus R6 would be. Can I add 12TB drives in my next upgrade? 

PROMISE Technology Inc. posted this 05 June 2019

Hi Ian,

I came here because I'm wondering what the theoretical maximum volume per head (and overall volume) on a Promise Pegasus R6 would be.

Unfortunatly, the largest drives tested are on the compatibility list. While others have verified that Pegasus works with certain size drives, the Pegasus was never tested with 12TB drives as they did not exist while the Pegasus was in production.

Can I add 12TB drives in my next upgrade?

If you want, but a good outcome is not guranteed. I would suggest that the farther you go from what was tested (sizewise), the less likely everything will work as expected. 12TB drives may work fine, or they may not. There is no way to tell in advance. So if you do decide to try them, your best bet would be to create an hfs+ filesysyem on the LUN type you desire, and write to the very end of it to test and verify the files. This may take a bit of time, but it's the only way to be sure. 

Also keep in mind that most of the newer drives have 4K native sectors and emulate 512 btye sectors (512e). That's all well and good, the Pegasus will work with 512e, but if misalignment occurs then preformance will take a hit. This may or may not be a problem, depending on your use case. There may be other design characteristics in newer drives that may or may not cause issues for the Pegasus.

Robert Brownlie posted this 11 June 2019

Hi Ian,

The specific drives that I use for my Promise R6 (1.st. generation) is WD Red WD60EFRX. These are still working fine. I now intend adding either 14TB or the new 16Tb drives to my R6. (1. st. gen) Iron wolf or iron wof pro 7200RPM. Once they come more readly available.

I also did add 10TB iron wolfs to my R4 (second generation) and these worked fine. RAID 0. I notice companys are selling R4 second generations with 12, 14 and now 16TB drives.

Please let me know how the 12TB drives go on the R6.

 

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