[Lustre-discuss] client randomly evicted

Yong Fan Yong.Fan at Sun.COM
Fri May 16 04:20:13 PDT 2008


Robin Humble 写道:
> 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 :-)
>
>   
ah! little issue for that, will fix it soon.

Regards!
--
Fan Yong
> 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.
>>>> _______________________________________________
>>>> 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
>>
>>
>>
>>
>>
>>     
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>   




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