Messages in this thread | | | From | Neil Brown <> | Date | Sat, 8 Jul 2006 08:00:55 +1000 | Subject | Re: Kernel 2.6.17 and RAID5 Grow Problem (critical section backup) |
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On Friday July 7, jpiszcz@lucidpixels.com 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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