Today was a public holiday so spent the time with xen-tools in Debian Squeeze, setting up 4 VMs on an Atom PC. Not bad. They idle well at least.
In /etc/exports there must be at least one export with fsid=0. This is the root of the exports hierarchy. See: http://www.vanemery.com/Linux/NFSv4/NFSv4-no-rpcsec.html#pseudofs
On the NFS server, the nfs/<hostname> key in the keytab needs to be of type des-cbc-crc. There should be no other key types in the keytab for nfs/<hostname>. See: http://www.citi.umich.edu/projects/nfsv4/linux/krb5-setup.html
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