SAN - IBM TotalStorage Switch ISL Trunking

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Published on August 27, 2002

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IBM Form #: TIPS0043


Authors: Jon Tate

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    Abstract

    Inter Switch Link (ISL) Trunking can dramatically improve the performance, manageability, and reliability for business-critical storage applications. By aggregating up to four ISLs into a single logical 8 Gb/s trunk group, this feature supports efficient high-speed communications throughout Storage Area Networks (SANs). By optimizing available switch resources, ISL Trunking decreases congestion. In addition, ISL Trunking reduces administrative workload since ISLs can be managed as a single entity rather than individually. Moreover, ISL Trunking can significantly increase data availability: even if an individual ISL failure occurs, I/O can continue at a reduced bandwidth as long as at least one ISL in the trunk group remains available. Together, these capabilities give organizations a powerful and flexible tool to extract the greatest performance and value from their SAN investments.

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