User profile for user: Tom Ritch
Tom Ritch Author
User level: Level 2
280 points

I removed the HDs from my Pegasus R4i. How can I know which goes where when reinstalled?

Pegasus R4i is in my 2019 MacPro. Drives were configured into a RAID5. Drives are still in their sleds. In my older MacPro3,1 the drive sleds were numbered, making replacement to the original slot simple. Now I see Pegasus drive sleds seem all alike. Does the Pegasus RAID controller assign disks to their RAID location base on their physical slot? Or can the controller recognize each disk and use it in its logical markers no matter what physical location it is mounted?

Posted on Feb 9, 2025 2:19 PM

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User profile for user: Grant Bennet-Alder
Grant Bennet-Alder
User level: Level 10
135,259 points

Feb 9, 2025 2:32 PM in response to Tom Ritch

it does not matter.


RAID-ness is recorded on the drives, and does not depend on their position. You could take those drives out, shuffle them, and re-install in a different chassis, and they would still be a functioning RAID.


<< In my older MacPro3,1 the drive sleds were numbered, making replacement to the original slot simple. >>


Yes, but -- those numbers are for your aesthetic convenience ONLY, and have no electrical representation that your Mac can read. I have several old MacPro units, and the sled numbers are by now all scrambled (and a few have a OWC MountPro SSD sled instead).


also, the same is true of a RAID in the drive bays. You could shuffle the drives, re-install in a different order or a different Mac, and they would still be a RAID and work fine.

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I removed the HDs from my Pegasus R4i. How can I know which goes where when reinstalled?

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