[Lustre-discuss] speed counters? default quotas?

[Brock Palen]

Hi,
Is there a simple way from one host to get some counters data that
could be used to gauge the performance lustre is providing under a
given load?

We would like the following:

Read_byte/sec
Write_byte/sec
Create/sec
modify/sec

We would prefer to do this form one host (mds?)

Last is there a way to set a system wide default quota? Say all
users get a 1TByte quota on /scratch by default.
Thanks!

Brock Palen
Center for Advanced Computing
bro...@umich.edu
(734)936-1985

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[Andreas Dilger]

On Oct 09, 2007 09:57 -0400, Brock Palen wrote:
> Is there a simple way from one host to get some counters data that
> could be used to gauge the performance lustre is providing under a
> given load?
>
> We would like the following:
>
> Read_byte/sec
> Write_byte/sec
> Create/sec
> modify/sec
>
> We would prefer to do this form one host (mds?)

There are stats for this, but not in a single location. The metadata stats
can be seen with e.g. "llstat -i 1 mds" on the MDS, and the IO stats can be
seen on the individual OSTs with "llstat -i 1 ost_io". There are other
stats counters, please read the documentation.
http://manual.lustre.org/manual/LustreManual16_HTML/DynamicHTML-20-1.html

> Last is there a way to set a system wide default quota? Say all
> users get a 1TByte quota on /scratch by default.

Yes, Lustre supports quotas. Please see the documentation.
http://manual.lustre.org/manual/LustreManual16_HTML/DynamicHTML-09-1.html

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

[Brock Palen]

Yes, i found these in the pdf documentation, i was using the cached
copy of manual.lustre.org when the site was down. Thanks for the
llstat command though, i was looking at /proc directly.

Brock Palen
Center for Advanced Computing
bro...@umich.edu
(734)936-1985