Recently I ran into an interesting whitepaper by VMware that compared the performance of the different storage protocols: Fibre Channel, iSCSI and NFS. It seems that the whitepaper doesn't do a good job in comparing all the relevant tasts of all these protocol but it is interesting nontheless.
"This study provides performance comparisons of various
storage connection options available to VMware® ESX Server. We used the widely used IOmeter benchmark for
the comparison. The results show that all four network storage options can
reach wire‐speed throughput when properly configured. The wire‐speed throughput is also maintained
with multiple virtual machines driving concurrent I/Os, indicating that the limiting factor in performance
scalability is not in ESX Server. The data also demonstrates that, although Fibre Channel has
the best performance in throughput, latency, and CPU efficiency among the four options, iSCSI and NFS are
also quite capable and may offer a better cost‐to‐performance ratio
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