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June 25, 2009



Hi Chuck,

Oversubscription already exists for quite some time within Networked Storage, in the SAN, but also at the Storage array level. Sometimes referred to as Fan-in/Fan-out. Seldom do we use single server/dedicated front end controller ports on the arrays, but instead servers share the front end array ports in for example a 10:1 ratio. This is however oversubscription from a bandwidth/cpu or even cache(with or without QoS) perspective. Where there is still (valid) resistance is in the oversubscription of capacity, as used with Thin(or virtual) provisioning. Due to the implications(crash) of not having capacity available for a server or application, we tend to do a 1:1 capacity allocation. Mechanisms such as Quality of Capacity would help a lot to overcome some of the "discomforts".

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Chuck Hollis

  • Chuck Hollis
    SVP, Oracle Converged Infrastructure Systems

    Chuck now works for Oracle, and is now deeply embroiled in IT infrastructure.

    Previously, he was with VMware for 2 years, and EMC for 18 years before that, most of them great.

    He enjoys speaking to customer and industry audiences about a variety of technology topics, and -- of course -- enjoys blogging.

    Chuck lives in Vero Beach, FL with his wife and four dogs when he's not traveling. In his spare time, Chuck is working on his second career as an aging rock musician.

    Warning: do not ever buy him a drink when there is a piano nearby.

    Note: these are my personal views, and aren't reviewed or approved by my employer.
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