On Friday July 7, [email protected] wrote:
> >>
> >> Jul 7 08:44:59 p34 kernel: [4295845.933000] raid5: reshape: not enough
> >> stripes. Needed 512
> >> Jul 7 08:44:59 p34 kernel: [4295845.962000] md: couldn't update array
> >> info. -28
> >>
> >> So the RAID5 reshape only works if you use a 128kb or smaller chunk size?
> >>
>
> Neil,
>
> Any comments?
>
Yes. This is something I need to fix in the next mdadm.
You need to tell md/raid5 to increase the size of the stripe cache
before the grow can proceed. You can do this with
echo 600 > /sys/block/md3/md/stripe_cache_size
Then the --grow should work. The next mdadm will do this for you.
NeilBrown
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