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Vol. 1 No. 12 February 2003

Types of Block Data Replication

All block data replication schemes are not created equal. Some are implemented as part of the storage array, others as part of a host server and still others within the network. Replication can also happen synchronously--where the local application waits for confirmation from the mirror before a write is completed--or asynchronously, where there can be some lag between the source and the target data. The following matrix shows some sample replication products and where they fit in. (Note that some of these products may be applicable in more than one box.)   SYNCHRONOUS ASYNCHRONOUS Array EMC SRDF, Hitachi TrueCopy, IBM PPRC HDS TrueCopy, EMC SRDF, IBM PPRC Host Veritas Volume Replicator Veritas Volume Replicator Network FalconStor IPStor Mirroring Topio SANsafe, DataCore SANsymphony, Asynchronous Internet Mirroring (AIM)

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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

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