System News
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Articles for the keywords: ZFS Deduplication
07 May 2012 How to Size Main Memory for ZFS Deduplication [26079]
Will Save You Disk Space Without Reducing Performance

In his post on "How to Size Main Memory for ZFS Deduplication" Dominic Kay explains that, prior to using deduplication, one must first determine whether that operation is worthwhile by finding out the deduplication ratio and the memory requirements. Fortunately, ZFS itself provides a means to assist with this determination: the ZFS debugging tool, which will tell users whether deduplication will result in storage space savings. Establishing the memory available for deduplication can be accomplished by multiplying the number of allocated blocks by 320 bytes (the size of each in-core deduplication table).
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03 Aug 2011 Determining the Costs of Using Dedup with ZFS [24414]
Blogger Takes a Case Study Approach

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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31 Dec 2010 100 Most Popular Articles of 2010 [23804]
1036 Articles were Posted in Volumes 143 through 154

These are the 10 most popular articles that were posted in 2010:

  • Oracle's Hardware and Systems Support Policies (2010-04-07)
  • Oracle's Plans for Sun Products, Technologies (2010-02-04)
  • Choosing SPARC or Intel Processors (2010-01-22)
  • Oracle-Sun and Hitachi Data Systems End Reseller Agreement (2010-03-04)
  • Sun's Niagara 3 (2010-02-25)
  • Tutorial on IP Multipathing (IPMP) (2010-02-04)
  • In the Linux vs. Solaris Debate, Watch out for Scalability FUD (2010-02-19)
  • Sun Ray 3 Plus Client (2010-04-06)
  • Oracle Enterprise Pack for Eclipse 11g Accelerates Java Development (2010-08-25)
  • Capitalizing on Sun Technologies (2010-05-19)

The web version of this article has the list of the 100 most popular articles posted in 2010.
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28 Apr 2010 The Impact of ZFS Dedup Procedures on System Performance [22961]
First, Avoid Procedures that Generate Duplication

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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31 Mar 2010 OpenSolaris ZFS Deduplication [22978]
Learn How it Saves Space, Costs; Get Multiple Resource Links

"ZFS Deduplication is real, and ready for you to profit from," writes Oracle-Sun Principal Field Technologist Constantin Gonzalez, who recently posted a blog on everything you need to know about ZFS deduplication and a few links to help readers dig deeper.
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