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How RAID system reliable? possible of raid system failure (lemm.ee)

submitted 1 month ago by aTun@lemm.ee to c/selfhosted@lemmy.world

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I know how RAID work and prevent data lost from disks failures. I want to know is possible way/how easy to recover data from unfunctioned remaining RAID disks due to RAID controller failure or whole system failure. Can I even simply attach one of the RAID 1 disk to the desktop system and read as simple as USB disk? I know getting data from the other RAID types won't be that simple but is there a way without building the whole RAID system again. Thanks.

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[–] anamethatisnt@lemmy.world 13 points 1 month ago (2 children)

RAID is never a replacement for backups.
Never work directly with a surviving disk, clone it and work with the cloned drive.
Are you sure you can't rebuild the RAID? That really is the best solution in many cases.
If a RAID failure is within tolerance (1 drive in a RAID5 array) then it should still be operational. Make a backup before rebuilding if you don't have one already.
If more disks are gone than that then don't count on recovering all data even with data recovery tools.

[–] r00ty@kbin.life 3 points 1 month ago (1 children)

The OP made clear it was a controller failure or entire system (I read hardware here) failure. Which does complicate things somewhat.

[–] anamethatisnt@lemmy.world 3 points 1 month ago

Yeah, if there's a full system failure without any backups and no option to get the system operational again then I would land in clone the drives before trying to restore data from them.