[Lustre-discuss] client randomly evicted

[Andreas Dilger]

On Apr 30, 2008  11:40 -0400, Aaron Knister wrote:
> Some more information that might be helpful. There is a particular code 
> that one of our users runs. Personally after the trouble this code has 
> caused us we'd like to hand him a calculator and disable his accounts but 
> sadly that's not an option. Since the time of the hang, there is what seems 
> to be one process associated with lustre that is running as the userid of 
> the problem user- "ll_sa_15530". A trace of this process in its current 
> state shows this -
>
> Is this a problem with the lustre readahead code? If so would this fix it? 
> "echo 0 > /proc/fs/lustre/llite/*/statahead_count "

Yes, this appears to be a statahead problem.  There were fixes added to
1.6.5 that should resolve the problems seen with statahead.  In the meantime
I'd recommend disabling it as you suggest above.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.