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@xxxxxxxxxx
[mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of ffv@xxxxxxxxxxx
Sent: Tuesday, November 04, 2008 2:13 PM
To: linux-cluster@xxxxxxxxxx
Subject: 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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