On Tue, 09 May 2006 00:18:32 +0200, PFC said: > Linux RAID has a special option for that : you can trigger a check, > which > will re-read the entire disks and, if a read error occurs, re-write the > failing sector with good data from the other drives in the RAID. The drive > with the bad sector will then remap it to another sector.
If you have 2 mirrored disks, and are replacing one, you don't have a good block to read it from. The failure mode was a RAID controller that didn't properly handle re-writing the bad block on the first disk, so when the second disk got a bad block, you were screwed....
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