Re: 2.6.24-rc6 reproducible raid5 hang

[Tim Southerwood <ts@dionic.net>]

Carlos Carvalho wrote:
> Tim Southerwood (ts@dionic.net) wrote on 23 January 2008 13:37:
>  >Sorry if this breaks threaded mail readers, I only just subscribed to 
>  >the list so don;t have the original post to reply to.
>  >
>  >I believe I'm having the same problem.
>  >
>  >Regarding XFS on a raid5 md array:
>  >
>  >Kernels 2.6.22-14 (Ubuntu Gutsy generic and server builds) *and* 
>  >2.6.24-rc8 (pure build from virgin sources) compiled for amd64 arch.
> 
> This has been corrected already, install Neil's patches. It worked for
> several people under high stress, including us.
> -
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Hi

I just coerced the patch into 2.6.23.14, reset 
/sys/block/md1/md/stripe_cache_size to default (256) and rebooted.

I can confirm that after 2 hours of heavy bashing[1] the system has not 
hung. Looks good - many thanks. But I will run with a stripe_cache_size 
of 4096 in practise as it improves write speen on my configuration about 
2.5 times.

Cheers

Tim



[1] Rsync > 50GB to raid pluf xfs_fsr + dd 11GB of /dev/zero to same 
filesystem.