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Vol. 1 No. 12 February 2003

Virtualization in the switch? Not so fast

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 ...

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Features in this issue

  • Midrange Arrays Inherit High-End Smarts

    Virtualization layers, once a feature of only the most expensive storage subsystems, are beginning to ship with midrange storage systems.

  • Optimize database storage

    by  Jim Booth

    In this article, author and consultant Jim Booth maintains that different database objects may each require their own type of storage to make the database operations run more smoothly. Whether you're dealing with tablespaces, indexes, redo logs or archives -- there's a right and wrong storage choice for each database component. This article explains what they are.

  • Inside the new Symmetrix

    by  Michael Desmond

    Inside the new Symmetrix

Columns in this issue