NetApp just released a very interesting 38-pages paper comparing storage protocols performance in VMware vSphere 4.0 and VI 3.5 environments with Rackable S44 servers and FAS3170 arrays.
The paper, titled VMware vSphere and ESX 3.5 Multiprotocol Performance Comparison Using FC, iSCSI, and NFS, highlights a significant performance improvement in vSphere, mostly for iSCSI and NFS, since both have Jumbo Frame support.
The document also includes an comparison between 4GB FC, 1 Gigabit Ethernet and 10 Gigabit Ethernet, in terms of host CPU utilization and latency, which is worth a look.
Thanks to Yellow Bricks for the news.