Quoting David <lists@xxxxxxxxx>:
Or is the correct way
to remove the "bad" superblock drive from the array, mount the md,
remove the file then resync the array?
Common sense says this is correct.
If it is possible to do either of the above, how do I stop the
recovery? It now starts automatically at live CD boot, repeating from
15.7% over and over. My knowledge of the tools is bad but I tried the
following:
# mdadm /dev/md0 --remove /dev/sda1
and
# mdadm -f /dev/md0 --remove /dev/sda1 (no idea if the -f even makes
sense there)
Looking at http://smartmontools.sourceforge.net/BadBlockHowTo.txt I
tried to figure out what file was in the bad blocks but it turned out
there wasn't one, it was just unused space.
My fix, for completeness, was this:
Force failure of the corrupt half of the mirror, using
# mdadm --manage /dev/md0 --fail /dev/sda
Mount the other one and fill free space with zeros
# mount /dev/md0 /mnt/test
# dd if=/dev/zero of=/mnt/test/bigfile
# sync
smartctl now showed that the pending sector had been reallocated, so I
removed the bigfile and hot added the other drive
# mdadm --manage /dev/md0 --add /dev/sda
The recovery went fine this time and both partitions were shown as
correct and active. I had to fsck another md before it would boot
correctly but the machine is now back up and working correctly.
Thanks for your help previously, it helped me along the right lines to
start fixing this one.
David
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