Re: RAIS5 Rebuild Help - Possible Data Offset

[NeilBrown <neilb@suse.de>]

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On Mon, 31 Mar 2014 14:54:31 +0800 Yorik <yoriks13@westnet.com.au> wrote:

> Hi Neil
> 
> Thanks very much for the help and advice.. Output as follows.
> 
> [root@desktop mdadm]# ./mdadm --assemble --force --verbose /dev/md0
> /dev/sd[abc]1 /dev/sd[defgi]
> mdadm: looking for devices for /dev/md0
> mdadm: superblock on /dev/sdf doesn't match others - assembly aborted
> 
> 
> Maybe there has been some differences in Data Offset and superblock
> sizes with different versions of mdadm. I am not really sure what to
> do now, I just got back from a long project overseas and was about to
> start looking deeper into my options.
> 
> Appreciate any further help or advice that you have.


Could you post the full output of 
  mdadm --examine /dev/[abc]1 /dev/sd[defgi]

Some is clearly different at least with sdf.

NeilBrown

> 
> Regards
> Derek
> 
> On 31 March 2014 14:29, NeilBrown <neilb@suse.de> wrote:
> > On Sat, 1 Feb 2014 15:56:14 +0800 Yorik <yoriks13@westnet.com.au> wrote:
> >
> >> Thank you for your help. Sorry for my omission, I thought I had put
> >> that in. It was one of the first things that I tried and have numerous
> >> times since.
> >>
> >> #mdadm -Af /dev/md0 /dev/sd[abc]1 /dev/sd[defgi]
> >> mdadm: /dev/md0 assembled from 5 drives - not enough to start the array.
> >>
> >> Then if I try the command again, I get the following
> >>
> >> # mdadm -Af /dev/md0 /dev/sd[abc]1 /dev/sd[defgi]
> >> mdadm: /dev/sda1 is busy - skipping
> >> mdadm: /dev/sdb1 is busy - skipping
> >> mdadm: /dev/sdc1 is busy - skipping
> >> mdadm: /dev/sdd is busy - skipping
> >> mdadm: /dev/sde is busy - skipping
> >> mdadm: /dev/sdf is busy - skipping
> >> mdadm: /dev/sdg is busy - skipping
> >> mdadm: /dev/sdi is busy - skipping
> >>
> >> And my /proc/mdstat looks like this, with all drives marked as spare.
> >>
> >> # cat /proc/mdstat
> >> Personalities :
> >> md0 : inactive sda1[0](S) sdf[7](S) sdg[8](S) sde[5](S) sdi[6](S)
> >> sdd[4](S) sdc1[2](S) sdb1[1](S)
> >>       23442114872 blocks super 1.1
> >>
> >> unused devices: <none>
> >
> > If this is still a problem then please:
> > 1/ get the latest mdadm:
> >      cd /tmp
> >      git clone git://neil.brown.name/mdadm
> >      cd mdadm
> >      make
> > 2/ stop the array
> >      ./mdadm --stop /dev/md0
> > 3/ force-assemble the array with --verbose:
> >
> >      ./mdadm --assemble --force --verbose /dev/md0 /dev/sd[abc]1 /dev/sd[defgi]
> >
> > and report all the output of the last command.
> >
> > NeilBrown
> >


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