Blog by PQR

VMware published a whitepaper about an  I/O performance test for Exchange 2007 . What should be better: fibre, iSCSI or NFS?

Conclusion:

"All three protocols tested have shown to be able to support 16,000 Exchange users in both the Heavy and Double Heavy workloads.  These workloads stressed a 16-core HP DL 580 server to approximately 60 percent CPU utilization and pushed an average of over 5,000 IOPS to the attached NetApp storage array. This throughput was maintained while the average latency stayed under 220  milliseconds and 95th percentile latency remained under one second. Fibre Channel provided the best performance with the lowest CPU utilization. NFS and iSCSI performance was comparable with slightly longer latencies, and slightly higher CPU utilization."

Check the Whitepaper:   http://tiny.cc/eHX8T

Cheers, Peter!