Me being extra careful and trying find out from someone who already have done ESX 3.5 to vSphere 4 upgrade that if NFS mounted datastores needs some tweaking etc going from 3.5 to 4.0? I have FAS3040 with DataONTAP 7.3.2P4
thanks a lot in advance for your comments/experiences
What version of vSphere are you going to? If you are planning on a straight jump to 4.1 I would suggest that you look at implementing the new NetApp VSC 2.0 console on your vCenter server if you have license support for it. This will allow you to review the NFS settings/tweaks on your filer right from the vSphere Client which is pretty slick.
How is your NFS presented to your ESX hosts? Do you have a multi-mode VIF?