Re: reshape failure

[NeilBrown <neilb@suse.de>]

On Wed, 11 May 2011 14:06:23 -0400 Tobias McNulty <tobias@caktusgroup.com>
wrote:

> On Thu, Feb 17, 2011 at 4:39 PM, Tobias McNulty <tobias@caktusgroup.com> wrote:
> >
> > On Wed, Feb 16, 2011 at 4:06 PM, NeilBrown <neilb@suse.de> wrote:
> > >
> > > On Wed, 16 Feb 2011 15:41:46 -0500 Tobias McNulty <tobias@caktusgroup.com>
> > > wrote:
> > > >
> > > > Now I see this in /etc/mdstat:
> > > >
> > > > md0 : active raid6 sdf[0] sdg[5](S) sdh[4] sdc[3] sdd[2] sde[1]
> > > >       5860543488 blocks super 0.91 level 6, 64k chunk, algorithm 2 [5/5] [UUUUU]
> > > >       [=>...................]  reshape =  9.9% (193691648/1953514496)
> > > > finish=97156886.4min speed=0K/sec
> > > >
> > > > Is the 0K/sec something I need to worry about?
> > >
> > > Maybe.  If the stays at 0K/sec and the 9.9% stays at 9.9%, then yes.  It is
> > > something to worry about.
> >
> > It seems like it was another buggy SATA HBA?? I moved everything back
> > to the on-board SATA ports (1 of the 2 drives in the OS RAID1 device
> > and the 5 non-spare devices in the RAID6 -> RAID5 device) and it's
> > happily reshaping again (even without the MDADM_GROW_ALLOW_OLD magic
> > this time):
> >
> > md0 : active raid6 sda[0] sde[4] sdd[3] sdc[2] sdb[1]
> >       5860543488 blocks super 0.91 level 6, 64k chunk, algorithm 2 [5/5] [UUUUU]
> >       [==>..................]  reshape = 10.0% (196960192/1953514496)
> > finish=11376.9min speed=2572K/sec
> >
> > Is it really possible that I had two buggy SATA cards, from different
> > manufacturers?  Perhaps the motherboard is at fault?  Or am I missing
> > something very basic about connecting SATA drives to something other
> > than the on-board ports?
> >
> > Currently I'm using a SuperMicro X7SPA-HF [1] motherboard with a
> > AOC-SASLP-MV8 [2] HBA, and the machine is running Debian squeeze
> > (2.6.32-5-amd64).
> >
> > Tobias
> >
> > [1] http://www.supermicro.com/products/motherboard/ATOM/ICH9/X7SPA.cfm?typ=H&IPMI=Y
> > [2] http://www.supermicro.com/products/accessories/addon/AOC-SASLP-MV8.cfm
> 
> So, after figuring out the hardware issues, the reshape appears to
> have completed successfully (hurray!), but /proc/mdstat still says
> that the array is level 6.  Is there another command I have to run to
> put the finishing touches on the conversion?
> 
> md0 : active raid6 sda[0] sde[4] sdd[3] sdc[2] sdb[1]
>       5860543488 blocks level 6, 64k chunk, algorithm 18 [5/5] [UUUUU]
> 

Just
   mdadm --grow /dev/md0 --level=5

should complete instantly. (assuming I'm correct in thinking that you want
this to be a raid5 array - I don't really remember the details anymore :-)


NeilBrown
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