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23 October 2009 Performance comparison of FCoE and iSCSI
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FCoE (Fibre Channel over Ethernet) is a newly emerging storage networking protocol, which encapsulates Fibre Channel frames inside Ethernet packets. As a new choice of the building blocks for SANs (Storage Area Networks), FCoE does not involve TCP/IP protocol processing that dominates the iSCSI processing costs, so it is considered more suitable for the data center than iSCSI. This paper evaluates the performance of software implementations of FCoE and iSCSI. We compare the two approaches on throughputs, average I/O response time and CPU utilizations at different disk I/O sizes. The measurement data shows that FCoE software implementation has a little higher throughput and less average I/O response time at small I/O sizes and a little lower throughput and more average I/O response time at larger I/O sizes than iSCSI software implementation. We also conduct the experiments to learn the effect of Jumbo Ethernet frames for FCoE and iSCSI. To better understand the overheads of FCoE processing, we do a profile analysis of execution hotspots, and assess the impact of CRC computation on FCoE performance. The results call for the need for optimized FCoE Target software and CRC offload in NIC hardware. PUBLISHER'S NOTE 25 August 2010: This paper has been updated, replacing the version published on 23 October 2009. If you downloaded the original version of the paper and no longer have access, please contact for assistance.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wei Tong "Performance comparison of FCoE and iSCSI", Proc. SPIE 7517, Photonics and Optoelectronics Meetings (POEM) 2009: Optical Storage and New Storage Technologies, 751712 (23 October 2009);

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