[Lustre-discuss] client randomly evicted

[Aaron Knister]

Ah! That would make a lot of sense. echoing 0 to statahead_count  
doesn't really do anything other than hang my session. Thanks!

-Aaron

On May 15, 2008, at 4:36 AM, Yong Fan wrote:

> Robin Humble 写道:
>> On Fri, May 02, 2008 at 03:16:31PM -0700, Andreas Dilger wrote:
>>
>>> 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.
>>>
>>
>> we're seeing the same problem.
>>
>> I think the workaround should be:
>>  echo 0 > /proc/fs/lustre/llite/*/statahead_max
>> ??
>>
>> /proc/fs/lustre/llite/*/statahead_count is -r--r--r--
>>
> Sure.
> "/proc/fs/lustre/llite/*/statahead_count" is statistics variable.
> "/proc/fs/lustre/llite/*/statahead_max " is the switch for
> enable/disable directory statahead.
>
> Regrads!
> --
> Fan Yong
>> cheers,
>> robin
>>
>> ps. sorry I've been too busy this week to look at the llite_lloop  
>> stuff.
>> _______________________________________________
>> Lustre-discuss mailing list
>> Lustre-discuss at lists.lustre.org
>> http://lists.lustre.org/mailman/listinfo/lustre-discuss
>>
>
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-discuss

Aaron Knister
Systems Administrator
Center for Research on Environment and Water

(301) 595-7000
aaron at iges.org