On Wed, 9 Dec 2015, George Rapp wrote:
# mdadm --assemble --verbose --invalid-backup --force --update=revert-reshape /dev/md4 $OVERLAYS mdadm: looking for devices for /dev/md4 mdadm: /dev/mapper/sdg4 is identified as a member of /dev/md4, slot 2. mdadm: /dev/mapper/sdi1 is identified as a member of /dev/md4, slot 5. mdadm: /dev/mapper/sdc4 is identified as a member of /dev/md4, slot 1. mdadm: /dev/mapper/sdh1 is identified as a member of /dev/md4, slot 3. mdadm: /dev/mapper/sdj1 is identified as a member of /dev/md4, slot 4. mdadm: /dev/mapper/sdd4 is identified as a member of /dev/md4, slot 0. mdadm: /dev/md4 has an active reshape - checking if critical section needs to be restored mdadm: Failed to find backup of critical section mdadm: continuing without restoring backup mdadm: added /dev/mapper/sdc4 to /dev/md4 as 1 mdadm: added /dev/mapper/sdg4 to /dev/md4 as 2 mdadm: added /dev/mapper/sdh1 to /dev/md4 as 3 mdadm: added /dev/mapper/sdj1 to /dev/md4 as 4 mdadm: added /dev/mapper/sdi1 to /dev/md4 as 5 mdadm: added /dev/mapper/sdd4 to /dev/md4 as 0 mdadm: /dev/md4: Need a backup file to complete reshape of this array. mdadm: Please provided one with "--backup-file=..." mdadm: (Don't specify --update=revert-reshape again, that part succeeded.) How can the array have an active reshape if the reshape pos'n is 0 on all devices? Doesn't that mean that the reshape never actually started? If so, can I just revert -- somehow -- to a 5-device RAID 6 array to recover my data?
Just a shot in the dark, what happens if you add a backup file to the above command, but without revert-reshape? Ie state both --invalid-backup but also supply a backup-file. The text above could indicate that this might help.
If you get the array up and running again but it's still reshaping but at position 0, issue a --continue to it (this has worked for others). Also, I would get the latest git version of mdadm and try with that one if you're still using v3.2.2 as per the link to your august original email.
-- Mikael Abrahamsson email: swmike@xxxxxxxxx -- 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
