Weighing your SAN Connectivity Options

When it comes to Storage Area Networks (SAN) currently the dominant standard is Fibre Channel (FC).  FC has the added complexity of having to manage an additional networking infrastructure for storage.  The alternative of iSCSI exists that allows customers to cut costs and ease management but the performance just isn’t there.  For less demanding workloads iSCSI can fill the gap between NAS and FC SANs.  Prior to the introduction of Fibre Channel over Ethernet (FCoE) in June of 2009 FC was your only option for high bandwidth applications.  FCoE provides the benefits of FC combined with the simplified management of a unified networking infrastructure.  Like iSCSI, FCoE uses standard Ethernet hardware to connect your devices. You may be thinking if they use the same hardware wouldn’t FCoE suffer from the same limitations as iSCSI? The answer is no.  This is because iSCSI relies on the TCP/IP protocol which adds additional overhead to storage systems and hosts; whereas FCoE does not.  Because of this FCoE’s processing characteristics are very similar to FC which allows performance characteristics to remain the same without investing in a separate FC infrastructure.  One benefit that FCoE brings to the table is the ability to work over a 10 Gigabit Ethernet.  As of right now FC is limited to 8 Gigabit connections and has been since 2008.  Currently most of the leading suppliers of SAN hardware support FCoE and as the supporting technologies become more cost-effective I believe you will see wider adoption of FCoE.