We have stability issues with vmware esx (3.0.2) on nfs whenever there is a cluster failover. The datastores come back online after the failover is complete (30-40 seconds), but some of the virtual servers (solaris/windows) can crash while the failover takes place.
There are probably some timeout settings I need to configure on all esx hosts, but the NetApp best practice guide on vmware/nfs does not mention changes other than the locking parameter. So I hope someone can share if they encountered the same issue and what they changed to improve it.