Whether -- or not -- to dedup is a question addressed by Constantin Gonzalez in a recent blog that subject the question to a cost/benefit analysis as a means of allaying the anxieties of those users who remain uneasy about the dedup capabilities of ZFS. Gonzalez blogs that, "the decision to use ZFS deduplication or not is almost always a simple cost/benefit analysis. When using deduplication, one needs to plan for at least some extra L2ARC SSD requirements, or better some extra RAM for storing the dedup table in a manner that doesn't negatively impact write performance. Especially RAM can become a decisive factor in deciding for or against deduplication, so usually a dedup savings factor of 2 is a necessary threshold for deduplication to become a real cost saver." He reviews the means in a case study approach to learn just how much space is saved in a dedup procedure; calculating the memory costs of using dedup; L2ARC as an alternative to dedup. Finally, Gonzalez lays out how to determine the break even point in assessing dedup costs and provides a couple rules of thumb.
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In his Oracle blog post on ZFS zpool and file system version numbers and features Steffen Weiberle points out that ZFS versions are conveniently backward compatible but that the reverse is not the case. It is therefore important, he writes, to know what the oldest kernel version is that one might with to attach a pool to, making sure that upgrades are not made that would render this impossible. He then provides a helpful table that lists the ZFS feaures introduced in Solaris 10 updates.
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It's fortunate that Constantin Gonzalez keeps lists, as he has assembled a number of 17 or more FAQs put to him on the subject of Flash-Memory SSDs and ZFS. And -- not to worry -- he also provides the answers in his blog "Constant Thinking."
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What performance characteristics are we expected to see from ZFS Storage appliance Dedup in the wake of the Sun Storage 7000 2010.Q1, asks Roch "Mars" Bourbonnais rhetorically in the blog "Dedup Performance Considerations." By way of coming up with an answer, he reviews the basics of ZFS dedup operations, then proceeds to an examination of the implications for performance.
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Sun Storage 7000 Management Plug-in for Oracle Enterprise Manager 10g Grid Controller creates a coupling between the enterprise-wide monitoring provided by Oracle Grid Control and the monitoring and analytics provided by Sun Storage 7000 Appliances, writes blogger Paul Monday. He explains further that the goal of the plug-in to Oracle Grid Control is to facilitate a Database Administrator in their use of Sun Storage 7000 Appliances without attempting to reproduce the world-class analytics available within Sun Storage 7000 Appliances.
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