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  • Performance impact: file fragmentation and SAN – Part V

    SQL Server workloads   So far, the discussions in all the previous posts (1, 2, 3, and 4) on the performance impact of file fragmentation on a drive presented from a high-end enterprise-class disk array are related to disk I/O workloads. Ultimately, you want to know how file fragmentation may impact your SQL Server workloads.   In ...
    Posted to Linchi Shea (Weblog) by Linchi Shea on December 29, 2008
  • Performance impact: file fragmentation and SAN – Part IV

    Lies, damned lies, and statistics!   If you have read my three previous posts (1, 2, 3), you may walk away with an impression that on a drive presented from a high-end enterprise class disk array, Windows file fragmentation does not have a significant performance impact. And I’ve given you empirical data—oh yeah, statistics—to support that ...
    Posted to Linchi Shea (Weblog) by Linchi Shea on December 22, 2008
  • Performance Impact: file fragmentation and SAN – Part III

    256KB Sequential Reads   In my two previous posts (1, 2), I highlighted the fact that while file fragmentation had a huge adverse performance impact on directly attached storage (DAS), it did not have much, if any, impact on the drive presented from a high end enterprise class disk array. That observation was derived from running disk I/O ...
    Posted to Linchi Shea (Weblog) by Linchi Shea on December 10, 2008
  • Performance impact: file fragmentation and SAN – Part II

    1KB Sequential Writes on DAS   There were some questions about the use 1KB sequential writes in my previous post to test the performance impact of file fragmentation on a drive presented from a high end enterprise class disk array.   There were two reasons for testing 1KB sequential writes: ·      SQL ...
    Posted to Linchi Shea (Weblog) by Linchi Shea on December 8, 2008
  • Performance Impact: file fragmentation and SAN -- Part I

    1KB Sequential Writes   It’s well known that disk I/O performance can be severely impacted by fragmentation at the file system level. In other words, when a file is allocated space from many small fragments, its performance can be much worse than when its space is allocated from a single contiguous chunk. The impact is most pronounced with ...
    Posted to Linchi Shea (Weblog) by Linchi Shea on December 7, 2008
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