On Wed, Oct 16, 2013 at 1:26 AM, NeilBrown <neilb@xxxxxxx> wrote: > On Mon, 14 Oct 2013 21:59:45 -0400 John Yates <jyates65@xxxxxxxxx> wrote: > >> Midway through a RAID5 grow operation from 5 to 6 USB connected >> drives, system logs show that the kernel lost communication with some >> of the drive ports which has left my array in a state that I have not >> been able to reassemble. After reseating the cable connections and >> rebooting, all of the drives appear to be functioning normally, so >> hopefully the data is still intact. I need advice on recovery steps >> for the array. >> >> It appears that each drive failed in quick succession with /dev/sdc1 >> being the last standing and having the others marked as missing in its >> superblock. The superblocks of the other drives show all drives as >> available. (--examine output below) >> >> >mdadm --assemble /dev/md127 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 >> mdadm: too-old timestamp on backup-metadata on device-5 >> mdadm: If you think it is should be safe, try 'export MDADM_GROW_ALLOW_OLD=1' >> mdadm: /dev/md127 assembled from 1 drives - not enough to start the array. > > Did you try following the suggestion and run > > export MDADM_GROW_ALLOW_OLD=1 > > and the try the --asssemble again? > > NeilBrown Yes I did, thanks. Not much change though. It accepts the timestamp, but then appears not to use it. mdadm --assemble /dev/md127 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 --verbose mdadm: looking for devices for /dev/md127 mdadm: /dev/sdb1 is identified as a member of /dev/md127, slot 4. mdadm: /dev/sdc1 is identified as a member of /dev/md127, slot 3. mdadm: /dev/sdd1 is identified as a member of /dev/md127, slot 2. mdadm: /dev/sde1 is identified as a member of /dev/md127, slot 0. mdadm: /dev/sdf1 is identified as a member of /dev/md127, slot 1. mdadm: /dev/sdg1 is identified as a member of /dev/md127, slot 5. mdadm: :/dev/md127 has an active reshape - checking if critical section needs to be restored mdadm: accepting backup with timestamp 1381360844 for array with timestamp 1381729948 mdadm: backup-metadata found on device-5 but is not needed mdadm: added /dev/sdf1 to /dev/md127 as 1 mdadm: added /dev/sdd1 to /dev/md127 as 2 mdadm: added /dev/sdc1 to /dev/md127 as 3 mdadm: added /dev/sdb1 to /dev/md127 as 4 (possibly out of date) mdadm: added /dev/sdg1 to /dev/md127 as 5 (possibly out of date) mdadm: added /dev/sde1 to /dev/md127 as 0 mdadm: /dev/md127 assembled from 4 drives - not enough to start the array. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
