R/W Latency to disks in virtual environments (VMWare)

Hi Forum,

I'm just curious what are your values for min/max/average values for r/w operations on virtual disks which are hosted on a SAN attached via fibre.
Unfortunately I have no values to compare with, but the values I get there for our groupwise servers seems to me to be a little bit high....
Also the performance monitor of one (groupwise) server shows higher latency for read operations that write operations. Shouldn't that be inverse?

I'm no expert in vmware, but interested in that vlaues! So I thought, why not ask in here? :)

Thanks in Advance,
Pascal