[Ocfs2-users] 10 Node OCFS2 Cluster - Performance

[Laurence Mayer]

Hi,

I am currently running a 10 Node OCFS2  Cluster (version 1.3.9-0ubuntu1) 
on Ubuntu Server 8.04 x86_64.
Linux n1 2.6.24-24-server #1 SMP Tue Jul 7 19:39:36 UTC 2009 x86_64 
GNU/Linux

The Cluster is connected to a 1Tera iSCSI Device presented by an IBM 
3300 Storage System, running over a 1Gig Network.
Mounted on all nodes:  /dev/sdc1 on /cfs1 type ocfs2 
(rw,_netdev,data=writeback,heartbeat=local)
Maximum Nodes: 32
Block Size=4k
Cluster Size=4k

My testing shows that to write simultaneously from the 10 nodes, 10 x 
200Meg files (1 file per node,  total of 2Gig) takes ~23.54secs.
Reading the files back can take just as long.

Do these numbers sound correct?

Doing dd if=/dev/zero of=/cfs1/xxxxx/txt count=1000 bs=2048000 (2Gig) 
from a single node takes 16secs.

(running the same dd command on an XFS filesystem connected to the same 
iSCSI Storage takes 2.2secs)

Is there any tips & tricks to improve performance on OCFS2?

Thanks in advance
Laurence