Quote:
Originally Posted by FrustratedReader
Mirrors and RAID 5 are not back-up, but purely for physical failure.
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It's even worse than that. If you're not careful, the RAID 'write hole' and/or non-synchronized writes to mirrors can leave your filesystems more damaged after a failure than they would have been had you not been using RAID at all. RAID is also intended to recover after complete drive failures only: more subtle failures (long rumoured, rarely seen) that lead to e.g. misdirected writes landing in the wrong place can, again, lead to uncorrected, widespread data corruption.
But that's OK. That's what your backups are for. (I hope you have *historical* backups, in case you didn't notice the damage before your most recent backup ran.)