Re: RAID6 reshape stalls immediately

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On 11/09/2015 05:02 PM, Peter Chubb wrote:

> I just did
>   mdadm --grow --continue /dev/md0
> 
> and the reshape started up again.  I didn't realise that mdadm had to
> keep going to do the reshape -- it must have died when I logged off
> last time.  So many other operations are handled entirely in the
> kernel...

mdadm spawns a copy of mdmon to perform these tasks.  If the process
hierarchy is strictly enforced, and kills off spawned processes when
the highest parent dies, that's a problem for mdadm.  I recall some
discussions about this with systemd and/or cgroups.  You might want
to make sure all of your utilities have the latest fixes.

Phil

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