I have a machine running Fedora 5, kernel 2.6.17-1.2187_FC5smp, with a
pair of software RAID 1 arrays (WD 500GB RE2), RAID 0'ed together. Every
14 days, one of the arrays has a "repair", (echo repair >
/sys/block/mdX/md/sync_action), run on it, to hopefully pick up and fix
dead sectors.
Over the weekend smartd emailed to say that there were "10 Currently
unreadable (pending) sectors" on /dev/sdc1.
mdstat showed this drive was still active in the array and this was the
case after smartd notified 4 hours later that there were now 20 pending
sectors.
After running a repair on the array, (confirmed by following resync
progress in mdstat), smartd was reporting 21 pending sectors.
Thinking I had nothing to lose, I failed and removed the drive and ran a
dd if=/dev/zero of=/dev/sdc1 bs=1048576
and as can be seen from the periodic smartd reports while this was
running, these sectors were fixed and smartctl -a now shows 0 pending
sectors.
Nov 28 08:07:30 bozo smartd[3066]: Device: /dev/sdc, 21 Currently
unreadable (pending) sectors
Nov 28 08:37:31 bozo smartd[3066]: Device: /dev/sdc, 11 Currently
unreadable (pending) sectors
Nov 28 09:07:31 bozo smartd[3066]: Device: /dev/sdc, 1 Currently
unreadable (pending) sectors
Nov 28 09:37:31 bozo smartd[3066]: Device: /dev/sdc, 1 Currently
unreadable (pending) sectors
Nov 28 10:07:31 bozo smartd[3066]: Device: /dev/sdc, 1 Currently
unreadable (pending) sectors
Curiously, the Reallocated_Sector_Ct only shows 2 instead of the 21 I
would have expected.
Anyway, my biggest concern is why
echo repair > /sys/block/md5/md/sync_action
appeared to have no effect at all, when I understand that it should
re-write unreadable sectors?
Regards,
Richard
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