how to verify file delegations

Hi,

I'm a sysadmin doing some testing with NFSv4 on RHEL6/Fedora 14. How can I verify that file read and write delegations are occurring ? The "delegpurge" and "delegreturn" values are zero from nfsstat.

Thanks,
Jimmy

If delegreturn is pinned at zero, then you are highly unlikely to be using delegations at all. Have you checked that the callback channel is set to a port that the server can connect to?

You can pin the callback channel to a particular port (in this example port 4048) using something like the following on the NFS client:

echo "options nfs callback_tcpport=4048" >> /etc/modprobe.d/options-local.conf

then edit your NFS client firewall settings to allow incoming TCP connections to that port. Finally, you'll want to reboot that client...

Trond

Trond Myklebust
Linux NFS client maintainer

NetApp
[email protected]
www.netapp.com