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virtual storage area network

Ports within a single switch can be partitioned into multiple VSANs, despite sharing hardware resources. Conversely, multiple switches can join a number of ports to form a single VSAN.

VSANs were designed by Cisco, modelled after the virtual local area network (VLAN) concept in Ethernet networking. In October 2004, the Technical Committee T11 approved VSAN technology into the American National Standards Institute (ANSI) as the standard.

A VSAN, like each FC fabric, can offer different high-level protocols such as FCP, FCIP, FICON, iSCSI. Each VSAN is a separate self-contained fabric using distinctive security policies, zones, events, memberships, and name services. Traffic is also separate.

Unlike a typical fabric that is resized switch-by-switch, a VSAN can be resized port-by-port.

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Désiré has been musing and writing about technology during a career spanning four decades. He dabbled in website building and web hosting when DHTML and frames were en vogue and started writing about the impact of technology on society just before the start of the Y2K hysteria at the turn of the last millennium. Following an eight-year stint at ITProPortal.com where he discovered the joys of global tech-fests, Désiré now heads up TechRadar Pro. Previously he was a freelance technology journalist at Incisive Media, Breakthrough Publishing and Vnunet, and Business Magazine. He also launched and hosted the first Tech Radio Show on Radio Plus.