For the most part, an iSCSI storage system SAN is cheaper than a Fibre Channel array SAN. Reasons for this include the components, hard drives and networking technologies used in each type of SAN.
This may be obvious, but its worth mentioning: An iSCSI SAN uses a standard Ethernet network. An FC SAN uses a fiber network.
Today most Fibre Channel array SANs support up to 4 GB of bandwidth, with talk of moving towards 8 GB. All iSCSI SANs support up to 1 GB of bandwidth on an Ethernet network with 10 GB on the horizon.
For applications that demand high performance, your best bet is to choose a Fibre Channel SAN. But most SMBs are not looking for the highest performance, so an iSCSI storage system SAN would be just the ticket.
Hard disk interfaces
iSCSI SANs commonly use SATA and SAS drives, primarily for their low cost and large capacity, whereas FC SANs use SCSI and FC drives for their high performance and reliability.
For additional comparisons, check out our more indepth
About the author: David L. Stevens is a storage manager for Carnegie Mellon University where he manages multiple iSCSI SANs.
This was first published in January 2007