You've just been lucky. I forget the exact scenario, but it is
something like if journal replay is happening while the RAID is being
reconstructed after a crash you can get garbage written to your disk.
> Three times in the last 9 months one of the drives reported errors
> and dropped offline, each time I have fdisked the bad drive,
> formatted it, fsck'ed it and found no problems, fdisked it again, and
> raidhotadd'ed it back in and it restored the array without problems.
This is probably a matter of block remapping replacing bad sectors when
you try to write to it.
Cheers, Andreas
-- Andreas Dilger http://www-mddsp.enel.ucalgary.ca/People/adilger/ http://sourceforge.net/projects/ext2resize/- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/