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Access "Virtualization in the switch? Not so fast"

Published: 29 Oct 2012

As virtualization spreads its tentacles to almost every part of the storage area network (SAN), a new generation of SAN switches is set to join the party and offer storage virtualization services as well. Here's how a switch with virtualization services plays in a multilayered virtualization scheme. But before discussing switch virtualization applications, let's quickly review the basics of SAN switching in order to separate the new functions from the old. As you know, a SAN switch forwards storage I/O transmissions that arrive in one (ingress) port through a different (egress) port. The egress port is typically determined by the destination ID that's contained in the transmission's header information. Switches maintain tables indicating which ports can communicate with known destinations. Virtualization operator The virtualization operator exports virtual devices to upstream I/O requestors. Switches can forward transmissions between similar and different types of networks. For instance, a switch can forward transmissions from one Fibre Channel (FC) link to ... Access >>>

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