Thanks for this reply. 8k and 16k seemed a lot more reasonable to me than what we were using. It was actually someone on Oracle's forums who recommended the 128K record size (but they might not have been using it as an NFS datastore for vSphere).
After using HP Lefthand iSCSI for years, I'm definitely a bigger fan of NFS - especially for vCloud Director where you have a ton if virtual machines on the same datastore. I like the fact that I'm getting some major space savings going this route and I can use de-duplication if I like. In the past, I used VMware's Linked Clones in vCenter Lab Manager and found it to not perform well. As a result, I decided to not enable Fast Provisioning in vCloud Director since it's pretty much the same thing (though it might perform better now with VMFS5 but again, I'm a convert to NFS).
Regards,
Nate