Hi there. I've got terrible problems with a Pegasus 2 R4 2TB x 4 array in RAID 5 (ie 6TB).
It's quite old but never had many problems with it apart from the occasional drive going down (every two years or so).
A week or so ago a drive appeared dead so I orderd a new one and replaced it. Turned the RAID off until the new drive arrived, replaced it and rebuilt (I've done this several times before and very familiar with the process). Rebuild was successful and all drives appeared to be good until this morning when I swapped all the drives into another R4 unit (I use them intechangeably and have been doing this for five years or more). This time, THREE drives appeared with red light and flagged up as dead. After some swapping out and restarting etc, three are now appearing as Staleconfig and the other one is Unconfigured. Terminal says they are online even though they are not so I cannot attempt to force them online to transfer data off.
Have taken each drive into a separate USB bay and run EaseUS recovery software on them all and EaseUS can see most if not all the files that were on the array by just looking at a single drive but I havent tried recovering it - I can't see how it can be recovered from a single drive but it can see this data on a single drive, even the drive that was reported as dead so there is something there and all hope is not lost!
My main concern is to get this data transferred off as there is no real backup (yes I know, but this happened between backups) - but I cannot read the files on the drives even thoughg they are clearly all there.
Is there any hope? It appears the partition map is corrupted or missing and I cannot find a way to recover this.