[Linux-cluster] GFS2 poor performance

[Jeff Sturm]

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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