From vSphere U1, VMware now support booting from a Paravirtualized SCSI adapter, why would you want to do this? Well why not, check out the VMware Performance Blog where VMware have tested this adapter and shared their results. VMware were able to achieve...

VMware Paravirtualized SCSI (PVSCSI driver) Introduced with vSphere 4 this driver can speed up and offload CPU. VMware Paravirtual SCSI (PVSCSI) adapter is able to achieve 12% more throughput with 18% less CPU cost compared to the LSI virtual adapter....

The last couple of weeks I’ve seen all these performance numbers(most not publicly available though) of vSphere, one even more impressing than the other. I think every one will agree that the latest one is really impressive, 364.00 IOPS is just insane....