I do see that a Linux system crash would still cause the Journal to become corrupted, mirrored Journal or not. Just 2 copies of a bad Journal at the point in time of the crash! But for disk related errors, mirroring at least the Journal would seem to make sense to me. Mirroring the whole disk would achieve the same thing, but obviously more data would have to be mirrored. I guess for Enterprise level users all disk would be in RAID arrays and hence their only real fear is that of a Linux system crash.
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