[Ocfs2-users] The mounting of too many OCFS2 volumes (i.e. 50 or more) per cluster

[Marko Sutic]

Hi list,

I have a question concerning number of OCFS2 volumes per cluster.

>From our storage vendor we received recommendations how to configure mount
volumes per database to gain the best possible performance.
Basically, we should separate redo logs,archive logs, temp, data, etc.

This is not hard to configure but I'm concerned about this line that I've
found on Oracle support site:

Linux OCFS2 - Best Practices [ID 603080.1]
Number of volumes
The mounting of too many OCFS2 volumes (i.e. 50 or more) per cluster is
likely to create a performance (process) bottleneck - this is not
specifically related to OCFS2. Ideally, it is desirable to have no more than
around 20 OCFS2 partitions per system.
See also http://oss.oracle.com/bugzilla/show_bug.cgi?id=992



In our configuration we would need more than 60 OCFS2 mount volumes per
cluster so I don't know should we expect any performance problems due to the
number of OCFS2 volumes?
What is your recommendation about number of OCFS2 volumes per cluster
regarding performance and stability?


Our kernel and ocfs2 version:
# uname -rvp
2.6.18-274.0.0.0.1.el5 #1 SMP Mon Jul 25 14:33:14 EDT 2011 x86_64

# rpm -qa|grep ocfs2
ocfs2-tools-1.6.3-2.el5
ocfs2-2.6.18-274.0.0.0.1.el5-1.4.8-2.el5
ocfs2console-1.6.3-2.el5



Thank you very much for your help.

Regards,
Marko Sutic
My LinkedIn Profile <http://hr.linkedin.com/in/markosutic>
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