Re: mdadm: too-old timestamp on backup-metadata

[William Heaton <acroporas@gmail.com>]

On 08/17/2010 07:09 PM, Neil Brown wrote:
> On Tue, 17 Aug 2010 16:00:01 -0400
> William Heaton<acroporas@gmail.com>  wrote:
>
>    
>> *I am not on the mailing list.  Please include acroporas@gmail.com in
>> any replies.*
>>
>> I had a 4-disk RAID5.  I added a 5th disk and at the same time converted
>> it to RAID6.
>>
>> Things started out looking good, but after about a day, the reshape
>> appeared to have stalled.  After waiting more than 24 hours without
>> seeing any progress I rebooted the computer.  Immediately before the
>> rebooting the array was running and all data was accessible.  But after
>> reboot, the array would not start.  Can anyone help me get the array
>> restarted?  Thanks
>>
>> ~$ uname -a
>> Linux pholidochromis 2.6.32-24-generic #39-Ubuntu SMP Wed Jul 28
>> 05:14:15 UTC 2010 x86_64 GNU/Linux
>>
>> ~$ mdadm --version
>> mdadm - v3.1.2 - 10th March 2010
>>
>>
>> ~$ sudo mdadm --assemble /dev/md0 /dev/sd[bcdel]1  -vv -f --backup-file
>> /media/Backup/rb
>> mdadm: looking for devices for /dev/md0
>> mdadm: /dev/sdb1 is identified as a member of /dev/md0, slot 4.
>> mdadm: /dev/sdc1 is identified as a member of /dev/md0, slot 2.
>> mdadm: /dev/sdd1 is identified as a member of /dev/md0, slot 0.
>> mdadm: /dev/sde1 is identified as a member of /dev/md0, slot 1.
>> mdadm: /dev/sdl1 is identified as a member of /dev/md0, slot 3.
>> mdadm:/dev/md0 has an active reshape - checking if critical section
>> needs to be restored
>> mdadm: too-old timestamp on backup-metadata on /media/Backup/rb
>> mdadm: Failed to find backup of critical section
>> mdadm: Failed to restore critical section for reshape, sorry.
>>
>>      
> cd /tmp
> git clone git://neil.brown.name/mdadm
> make
> sudo ./mdadm --assemble /dev/md0 /dev/sd[bcdel]1  -vv -f --backup-file  /media/Backup/rb
>
> If that still doesn't work.
>
> sudo sh
> export MDADM_GROW_ALLOW_OLD=1
> ./mdadm --assemble /dev/md0 /dev/sd[bcdel]1  -vv -f --backup-file  /media/Backup/rb
>
> NeilBrown
>
>    

$ sudo sh
# export MDADM_GROW_ALLOW_OLD=1
# ./mdadm --assemble /dev/md0 /dev/sd[bcdel]1  -vv -f --backup-file  
/media/Backup/rb
mdadm: looking for devices for /dev/md0
mdadm: /dev/sdb1 is identified as a member of /dev/md0, slot 4.
mdadm: /dev/sdc1 is identified as a member of /dev/md0, slot 2.
mdadm: /dev/sdd1 is identified as a member of /dev/md0, slot 0.
mdadm: /dev/sde1 is identified as a member of /dev/md0, slot 1.
mdadm: /dev/sdl1 is identified as a member of /dev/md0, slot 3.
mdadm:/dev/md0 has an active reshape - checking if critical section 
needs to be restored
mdadm: accepting backup with timestamp 1281747660 for array with 
timestamp 1282072264
mdadm: restoring critical section
mdadm: added /dev/sde1 to /dev/md0 as 1
mdadm: added /dev/sdc1 to /dev/md0 as 2
mdadm: added /dev/sdl1 to /dev/md0 as 3
mdadm: added /dev/sdb1 to /dev/md0 as 4
mdadm: added /dev/sdd1 to /dev/md0 as 0
mdadm: /dev/md0 has been started with 4 drives (out of 5).

Looks like that did the trick.  Thanks