[Lustre-discuss] client randomly evicted

[Robin Humble]

On Thu, May 15, 2008 at 08:23:20AM -0400, Aaron Knister wrote:
> Ah! That would make a lot of sense. echoing 0 to statahead_count doesn't 
> really do anything other than hang my session. Thanks!

I think the hang echo'ing into /proc is another bug, but yeah, deal
with the big ones first :-)

cheers,
robin

> -Aaron
>
> On May 15, 2008, at 4:36 AM, Yong Fan wrote:
>
>> Robin Humble ??????:
>>> 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.
>>> _______________________________________________
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>>>
>>
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>
> Aaron Knister
> Systems Administrator
> Center for Research on Environment and Water
>
> (301) 595-7000
> aaron at iges.org
>
>
>
>
>