Re: Kernel 2.6.17 and RAID5 Grow Problem (critical section backup)

[Neil Brown]

On Friday July 7, jpiszcz@xxxxxxxxxxxxxxx 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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/