Re: RAID6 grow failed

[NeilBrown <neilb@suse.de>]

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On Wed, 28 Mar 2012 03:54:45 -0400 Bryan Bush <bbushvt@gmail.com> wrote:

> On Wed, Mar 28, 2012 at 12:18 AM, NeilBrown <neilb@suse.de> wrote:
> > On Tue, 27 Mar 2012 22:44:18 -0400 Bryan Bush <bbushvt@gmail.com> wrote:
> >
> >> I hope this is the right place to ask this question.  I have at 8
> >> drive RAID 6 array that I wanted to grow to 13 drives (adding 5 more).
> >>  I issued the mdadm command and checked /proc/mdstat and all looked
> >> well.  However at some point in time a disk failed and that hung my
> >> system.  Upon reboot the array is inactive and I can't get it to
> >> reassemble.
> 
> > Hmmm... what do you have in /etc/mdadm.conf??
> 
> root@diamond:~# cat /etc/mdadm/mdadm.conf
> # mdadm.conf
> #
> # Please refer to mdadm.conf(5) for information about this file.
> #
> 
> # by default, scan all partitions (/proc/partitions) for MD superblocks.
> # alternatively, specify devices to scan, using wildcards if desired.
> DEVICE partitions
> 
> # auto-create devices with Debian standard permissions
> CREATE owner=root group=disk mode=0660 auto=yes
> 
> # automatically tag new arrays as belonging to the local system
> HOMEHOST <system>
> 
> # instruct the monitoring daemon where to send mail alerts
> MAILADDR root
> 
> # definitions of existing MD arrays
> 
> # This file was auto-generated on Fri, 14 Jan 2011 22:22:14 -0500
> # by mkconf $Id$
> 
> ARRAY /dev/md1 level=raid6 num-devices=8 metadata=01.02 name=1
> UUID=fa32e2c5:e7bda20b:32af7c90:c7ee61eb

I think this array now has 13 devices, not 8.  You might want to fix that.
If you do, it might all magically start working.

(also get rid of the metadata= or make it metadata=1.2)

Or just get rid of the num-devices= bit.

> ARRAY /dev/md0 level=raid5 num-devices=4 metadata=00.90
> UUID=989c3b8b:bd60d243:683690d9:73a11dfa
> 
> root@diamond:~#
> 
> >
> > Though if the names have changed at all it would be safer to do
> >
> >  mdadm -Asf /dev/md1 -u fa32e2c5:e7bda20b:32af7c90:c7ee61eb
> >
> 
> root@diamond:~# mdadm -Asf /dev/md1 -u fa32e2c5:e7bda20b:32af7c90:c7ee61eb
> mdadm: metadata format 01.02 unknown, ignored.
> mdadm: metadata format 00.90 unknown, ignored.
> mdadm: no devices found for /dev/md1

Odd.  I the above change to mdadm.conf doesn't help, try rerunning this
command with --verbose and report the result.

NeilBrown


> root@diamond:~#
> 
> Didn't seem to help.
> Any other ideas?
> Thanks
> -Bryan


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