RE: storage and filesystems on linux (ocfs2, ASM...)

Normally we use ASM for the database and install the Oracle binaries on local 
disks (no shared homes). NFS volumes are used for filesystems that need to be 
shared between the nodes. In 11g you could also use ACFS for that (no real 
experience with that).

The other option we use is NFS for the database as well.
In 11g with dNFS we get some very good performance by combining multiple 
network interfaces.

But OCFS2 should work.
It is very strange that your qlogic driver rescans the fabric, and ASM will not 
protect you against this. So the first thing I would do is to investigate what 
is causing this rescanning.


Regards,

 
Freek D'Hooge
Uptime
Oracle Database Administrator
email: freek.dhooge@xxxxxxxxx
tel +32(0)3 451 23 82
http://www.uptime.be
disclaimer: www.uptime.be/disclaimer

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Jonathan Smith
Sent: maandag 13 juni 2011 22:34
To: oracle-l@xxxxxxxxxxxxx
Subject: storage and filesystems on linux (ocfs2, ASM...)

We currently run ocfs2 1.4.x on RHEL 5, and we've been having huge problems. 
Our four-node cluster is simultaneously rebooting roughly once a week 
(sometimes more, sometimes less). The qlogic driver periodically rescans the 
fabric, and blocks IO while that happens. Sometimes it exceeds the ocfs2 
tiemout, and cluster goes kaboom. We've increased the timeout values to absurd 
levels (more than a minute), and somehow it still happens.

So, my question is what other folks are doing for cluster storage on RHEL. We 
need the ability to share the database files as well as oracle software 
installs.

I know ASM is an option, but we haven't investigated it yet. I think is 
instance-specific, and thus can't be used for the oracle installed files? Other 
options might be GFS2 (Red Hat's cluster filesystem), Veritas, or something 
else entirely.

What are you folks using, and how do you like it?

        Jonathan Smith

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