[Lustre-discuss] Modifying Lustre network (good practices)

Olivier Hargoaa olivier.hargoaa at bull.fr
Thu May 20 10:12:45 PDT 2010


Thanks Johann,

But you couldn't know but we already ran lnet self test unsuccessfully. 
I wrote results as answer to Brian.
What I do not know is if lnet test was good or not with bonding 
deactivated. I will ask administrators to test it.

Regards.

Johann Lombardi a écrit :
> On Thu, May 20, 2010 at 10:43:58AM -0400, Brian J. Murrell wrote:
>> On Thu, 2010-05-20 at 16:27 +0200, Olivier Hargoaa wrote: 
>>> On Lustre we get poor read performances 
>>> and good write performances so we decide to modify Lustre network in 
>>> order to see if problems comes from network layer.
>> Without having any other information other than your statement that
>> "performance is good in one direction but not the other" I wonder why
>> you consider the network as being the most likely candidate as a culprit
>> for this problem.
> 
> Maybe you should start with running lnet self test to compare read & write
> performance?
> 
> http://wiki.lustre.org/manual/LustreManual18_HTML/LustreIOKit.html#50598014_pgfId-1290255
> 
> Johann
> 
> 


-- 
Olivier, Hargoaa
Phone: + 33 4 76 29 76 25



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