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NFSv3 and NFSv4 Weirdness

Symptoms: RHEL 6.2 nodes going weird; rpciod using lots of CPU for no reason

Fix for non-IB Nodes

QLogic IB Nodes

Mounting as NFSv3

/etc/nfsmount.conf:

    Defaultvers=3
    Nfsvers=3
and, of course, remount all (or reboot).

Trouble at Mill

One fileserver refused to dish out NFSv3, only NFSv4. Useful diagnostic:

Investigation revealed: both portmap and rpcbind were running! Shutdown portmap; restart nfs and all was well.