[Linux-cluster] rhel 6.1 gfs2 performance tests

[Jordi Renye]

We are sharing gfs2 partition through samba
to three hundred clients aprox.

Partition GFS2 is mounted in two nodes of
cluster.

Clients can boot in linux and windows.

There is one share for home folder, another
for profiles, another for shared applications and
data: there is 5 shares.

>>  Also, did you mount with noatime, nodiratime?

Yes, I'm  mounting with these options.

Jordi Renye
LCFIB - UPC



El 22/07/2011 12:32, Steven Whitehouse escribió:
> Hi,
>
> On Fri, 2011-07-22 at 12:08 +0200, Jordi Renye wrote:
>> Hi,
>>
>> We have configured redhat cluster RHEL 6.1  with two nodes.
>> We have seen that performance of GFS2 on writing  is
>> half of ext3 partition.
>>
>> For example, time of commands:
>>
>> time cp -Rp /usr /gfs2partition/usr
>> 0.681u 47.082s 7:01.80 11.3%    0+0k 561264+2994832io 0pf+0w
>>
>> whereas
>>
>>    cp -R /usr /ext3partition/usr
>> 0.543u 24.041s 4:16.86 9.5%     0+0k 2728584+3166184io 2pf+0w
>>
>> With  ping_pong tool from Samba.org we've got next results:
>>
>> Los resultados son los siguientes:
>>
>> ping_pong /gfs2partition/pingpongtestfile 3
>> 1582 locks/sec
>>
>> With ping_pong test r/w:
>>
>> ping_pong -rw /gfs2partition/pingpongtestfile 3
>> data increment = 2
>> 4 locks/sec
>>
>> Do you think we can get better performance? Do you think
>> are "normal" and "good" results ?
>>
>> Which recommendations do you tell us to get better performance?
>>
>> For example, we don't have a heartbeat network exclusively, but
>> we have only one networks interface for application network and cluster
>> network.
>> Could we get better performance with one dedicated cluster network( for
>> dlm,heartbeath,...).
>>
>> Thanks in advanced,
>>
> It depends what you are trying to optimise for... what is the actual
> application that you want to run?
>
> cp doesn't use fcntl locks to the best of my knowledge, so I doubt that
> will have any particular effect on the performance. Also it would be
> quite unusual for fcntl locks to have any effect on the performance of
> the fs as a whole.
>
> Usually the most important factor is how the workload is balances
> between nodes. Also, did you mount with noatime, nodiratime?
>
> Steve.
>
>
> --
> Linux-cluster mailing list
> Linux-cluster at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-cluster


-- 

        Jordi Renye Capel
o o o  Tècnic de Sistemes N1
o o o  Laboratori de Càlcul
o o o  Facultat d'Informàtica de Barcelona
U P C  Universitat Politècnica de Catalunya - Barcelona Tech

        E-mail : jordir at fib.upc.edu
        Tel.   : 16943
        Web    : http://www.fib.upc.edu/

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