Justin has a post on P2000 performace. He copies a 350GB virtual machine from one Datastore to another. This was running 300GB 10k SFF disks, which is exactly what I’m considering installing (see a previous post). It took nine minutes. And my reseller reckons the performance of 10k SFF disks won’t be good enough for our seventy users! They sound just great to me.
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Carnival Boy 
One thing to remember is that there is an inverse relationship between throughput and IOps. As throughput goes higher your IOps normally goes down, because as we flood a 6Gbps pipe we are sending large streams of data, and not doing small chunks. Another thing to remember is that virtual machines are more about the IOps then the through put. Your best bet is to have a VMware partner run a capacity planner assesment on your physical servers and determine your current IO load. then you can size the SAN to fit that requirement. as a baseline figure a 10k drive is good for about 120 IOps, 15k drive is about 150-180. So if you need 1000 IOps then the math would be 1000 /120 = 8.3 spindles (so figure 9) at 10k RPM.