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Re: [Linux-cluster] GFS2 poor performance



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 redhat com [mailto:linux-cluster-bounces redhat com] On Behalf Of ffv tjpr jus br
Sent: Tuesday, November 04, 2008 2:13 PM
To: linux-cluster 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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