[Lustre-devel] LustreFS performance

Vitaly Fertman Vitaly.Fertman at Sun.COM
Tue Mar 10 09:40:53 PDT 2009

On Mar 10, 2009, at 2:55 PM, Mallik Ragampudi wrote:

> Vitaly,
> This is very comprehensive. Few comments:
> 1) I think it would be good to start with LLT2 (lustre-iokit: ior- 
> survey) and get an out-of-the-box performance
> picture/comparison (1.6 and 2.0) from the whole cluster before  
> testing the individual layers.

LLT2 is about underlying local fs on servers, not Lustre.
the overall ior-survey is OSTT3 (it was wrongly mentioned as ost-survey
in the document header, sorry, it must be ior-survey as written
in the detailed section)

> 2) Can this plan be extended to include CMD performance testing as  
> well ? I would expect that most
> of your test cases apply for the CMD as well ?

sure, I will extend it.

> 3) I assume the "CPU" parameter in your methodology refers to # of  
> CPUs in MDS, right ?

to the server which is being tested at the moment, i.e. OST for OST*  
MDS fro MDS* tests. In the mixed section it refers to MDS indeed.

> 4) I am not sure if we can test 32 cores without hitting other  
> bottlenecks beyond 8 coress on the servers.

if we hit some bottleneck, we will get a problem to solve, what is  
good ;)
however, to see the bottleneck from these results, it is better to run  
tests with different amount of CPUs (the same as for all the CPU  
tests, 1,2,8,32).

> This will cut down some combinations in the matrix.
> Thanks,
> Mallik


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