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

From: D'Hooge Freek <>
Date: Mon, 13 Jun 2011 23:32:52 +0200
Message-ID: <>

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.


Freek D'Hooge
Oracle Database Administrator
tel +32(0)3 451 23 82

-----Original Message-----

From: [] On Behalf Of Jonathan Smith Sent: maandag 13 juni 2011 22:34
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


-- Received on Mon Jun 13 2011 - 16:32:52 CDT

Original text of this message