Re: AW: AW: [Xen-users] Shared volume: Software-ISCSI or GFS orOCFS2?

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

I have a couple of reasons for not using NFS.  First, performance.  In my environment, OCFS2 offers better performance than NFS.  The second reason is single-point-of-failure.  I have a SAN with redundant controllers, redundant FC switches, and redundant paths between the controllers and the FC switches and between the FC switches and the XEN servers.  If I were to insert an NFS server into the mix, I'd be setting myself up for the time when the NFS server failed and took down all of my domUs.  Instead, I can use the cluster-aware FS and any of the servers can fail without affecting the other running servers.  OCFS2 has a built-in fencing mechanism, as well, that causes a hard reboot of the system if it loses communication with the other nodes in the cluster.  This allows the other systems to continue running without risking data corruption on the volume.  For me, setting up OCFS2 was just as easy, if not slightly easier, than setting up a separate NFS server for storing the domU information.

-Nick


-----Original Message-----
From: John Madden <jmadden@xxxxxxxxxxx>
To: xen-users@xxxxxxxxxxxxxxxxxxx
Cc: Rustedt, Florian <Florian.Rustedt@xxxxxxxxxxx>, Nick Couchman <Nick.Couchman@xxxxxxxxx>
Subject: Re: AW: AW: [Xen-users] Shared volume: Software-ISCSI or GFS orOCFS2?
Date: Mon, 17 Nov 2008 11:59:26 -0400

> So far now, i am at the point that i think that the best way is to use a
> cluster-aware file-system on the partitions?

Why not NFS?  Cluster filesystems sound like overkill for this scenario.

John

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