On Wed, 14 Sep 2011, James Harper wrote:
This is a followup to my nfs or ocfs2 question... it turns out that nfs failover doesn't work that smoothly due to hanging tcp connections and holding the block device open so I've gone with ocfs2.
Really? I, just a few moments ago, failed over the app servers that some of the cluster nodes in www.bom.gov.au use to mount /web. What might be tricky is things like fsid and the like. We using nfs ver 3, tcp, hard mounts, retrans=2 (ie, defaults as far as I know). The backend filesystem is vxfs but probably doesn't matter. I don't know how veritas works behind the scenes, but I suspect it just removes the IP address, unexports the filesystems then unmounts before reassigning the IP address to the destination host. I wonder how many tens of thousands of dollars were paying for the nice gui? -- Tim Connors