[Linux-cluster] rhel 6.1 gfs2 performance tests

[Steven Whitehouse]

Hi,

On Fri, 2011-07-22 at 12:41 +0200, Jordi Renye wrote:
> 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
> 
> 
Were the tests being run directly on gfs2, or via Samba in this case?

Steve.

> 
> 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.
> >
> >
> > --
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> > Linux-cluster at redhat.com
> > https://www.redhat.com/mailman/listinfo/linux-cluster
> 
>