[Neil Brown]
> Bug I expect... though actually it might be a different one to what
> I was thinking.
Good to hear that this was not the way it was supposed to work. The
failing RAID really had me worried that my files were lost. :)
> Try to assemble the array normally with --verbose.
> i.e.
>
> mdadm --assemble /dev/md3 --verbose /dev/sd[abcde]2
> (or whatever the right list of devices is).
>
> If this fails with something like
>
> mdadm: too-old timestamp on backup-metadata on ....
This is the message I saw:
meta:/dev# mdadm --assemble --verbose /dev/md3 sdb2 sdg2 sdh2 sdc2 sdf2
mdadm: looking for devices for /dev/md3
mdadm: sdb2 is identified as a member of /dev/md3, slot 0.
mdadm: sdg2 is identified as a member of /dev/md3, slot 4.
mdadm: sdh2 is identified as a member of /dev/md3, slot 3.
mdadm: sdc2 is identified as a member of /dev/md3, slot 1.
mdadm: sdf2 is identified as a member of /dev/md3, slot 2.
mdadm:/dev/md3 has an active reshape - checking if critical section needs to be restored
mdadm: too-old timestamp on backup-metadata on device-3
mdadm: too-old timestamp on backup-metadata on device-4
mdadm: Failed to find backup of critical section
mdadm: Failed to restore critical section for reshape, sorry.
Possibly you needed to specify the --backup-file
meta:/dev#
> then you can assemble the array by
>
> export MDADM_GROW_ALLOW_OLD=1
> mdadm --assemble ....(same command as above).
>
> This requires mdadm-3.1.2 or newer.
And this worked great!
meta:/dev# MDADM_GROW_ALLOW_OLD=1 mdadm --assemble --verbose /dev/md3 sdb2 sdg2 sdh2 sdc2 sdf2
mdadm: looking for devices for /dev/md3
mdadm: sdb2 is identified as a member of /dev/md3, slot 0.
mdadm: sdg2 is identified as a member of /dev/md3, slot 4.
mdadm: sdh2 is identified as a member of /dev/md3, slot 3.
mdadm: sdc2 is identified as a member of /dev/md3, slot 1.
mdadm: sdf2 is identified as a member of /dev/md3, slot 2.
mdadm:/dev/md3 has an active reshape - checking if critical section needs to be restored
mdadm: accepting backup with timestamp 1308555399 for array with timestamp 1309424388
mdadm: restoring critical section
mdadm: added sdc2 to /dev/md3 as 1
mdadm: added sdf2 to /dev/md3 as 2
mdadm: added sdh2 to /dev/md3 as 3
mdadm: added sdg2 to /dev/md3 as 4
mdadm: added sdb2 to /dev/md3 as 0
mdadm: /dev/md3 has been started with 5 drives.
meta:/dev#
Happy hacking,
--
Petter Reinholdtsen
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