I had very similar experience, with both OCFS2 and GFS. I was running
'iozone -s 262144 -r 1k' and when I had both nodes mount the partition
and run the benchmark, the wallclock time was 3 or 4 times that of a
single node (which was comparable to ext3 performance). Each node had
256MB of memory since I wanted to minimize (but not completely
eliminate) effects of buffer cache.<br>
<br>
I am attaching the numbers, if anyone is interested.<br>
<br>
-boris<br>
<br>
<br>
<div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Date: Wed, 8 Feb 2006 12:51:31 -0300<br>From: "Marcio Costa" <<a href="mailto:marciopc@interativainternet.com.br">
marciopc@interativainternet.com.br</a>><br>Subject: [Ocfs2-users] RHEL4 x86_64 OCFS2 10gR2 performance<br>To: "<a href="mailto:ocfs2-users@oss.oracle.com">ocfs2-users@oss.oracle.com</a>" <<a href="mailto:ocfs2-users@oss.oracle.com">
ocfs2-users@oss.oracle.com</a>><br>Cc: <a href="mailto:marciopc@interativainternet.com.br">marciopc@interativainternet.com.br</a>,<br> <a href="mailto:josue@interativainternet.com.br">josue@interativainternet.com.br
</a><br>Message-ID: <<a href="mailto:20060208153800.M95583@interativainternet.com.br">20060208153800.M95583@interativainternet.com.br</a>><br>Content-Type: text/plain; charset=iso-8859-1<br><br>Hi,<br><br>I have 2 IBM x346 eServers, both of them with 2 Qlogic HBAs (qla2340). They
<br>are connected rendundantly to a IBM DS4300 (fiber storage). I have Oracle<br>10gR2 RAC installed. RHEL4 U2 x86_64. My problem is the following:<br><br>Each server works very well, if alone,ie, if the other one has not mounted
<br>the ocfs2 partition. But when both of them are working, the performance goes<br>to hell.<br>For example: there is a job that, when it runs on one server alone, takes 4<br>seconds, but when I put both servers on line, it takes 3 minutes.
<br><br>What could it be ? Is there any conf that I could check. I was thinking<br>about change the ocfs2 for other fs (gfs or other)... could it be the case ?<br><br>Thanks in advance.<br><br>Marcio Costa.<br><br>
</blockquote></div><br>