[Linux-cluster] GFS2 poor performance

[Fabiano F. Vitale]

Hi,

for cluster purpose the two nodes are linked by a  patch cord cat6 and the 
lan interfaces are gigabit.

All nodes have a Fibre Channel Emulex Corporation Zephyr-X LightPulse and 
the
Storage is a HP EVA8100

I read the document 
http://www.redhat.com/promo/summit/2008/downloads/pdf/Thursday/Summit08presentation_GFSBestPractices_Final.pdf
which show some parameters to tune and one of  them is  demote_secs, to 
adjust to 100sec

thanks

> What sort of network and storage device are you using?
>
> Also, why set demote_secs so low?
>
> -----Original Message-----
> From: linux-cluster-bounces at redhat.com 
> [mailto:linux-cluster-bounces at redhat.com] On Behalf Of ffv at tjpr.jus.br
> Sent: Tuesday, November 04, 2008 2:13 PM
> To: linux-cluster at redhat.com
> Subject: [Linux-cluster] GFS2 poor performance
>
> Hi all,
>
> I´m getting a very poor performance using GFS2.
> I have two qmail (mail) servers and one gfs2 filesystem shared by them.
> In this case, each directory in GFS2 filesystem may have upon to 10000 
> files (mails)
>
> The problem is in performance of some operations like ls, du, rm, etc for 
> example,
>
> # time du -sh /dados/teste
> 40M     /dados/teste
>
> real    7m14.919s
> user    0m0.008s
> sys     0m0.129s
>
> this is unacceptable
>
> Some attributes i already set using gfs2_tool:
>
> gfs2_tool settune /dados demote_secs 100 gfs2_tool setflag jdata /dados 
> gfs2_tool setflag sync /dados gfs2_tool setflag directio /dados
>
> but the performance is still very bad
>
>
> Anybody know how to tune the filesystem for a acceptable performance 
> working with directory with 10000 files?
> thanks for any help
>
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