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  • 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
  • SQL Server and SANs: The QueueDepth Setting of a Host Bus Adapter (HBA)

    Too many DBAs tend to view a drive presented from a Storage Area Network (SAN) as something of a monolithic nature. They look at the drive as if it had some intrinsic performance characteristics. This view doesn't help one appreciate the true performance characteristics of such a drive. A more constructive view is to look at the drive as an I/O ...
    Posted to Linchi Shea (Weblog) by Linchi Shea on September 18, 2007
  • Should I Use a Windows Striped Volume?

    In Windows Server 2003, you can use the Disk Management console to create a striped volume over multiple dynamic disks (well, you can also create a mirrored, a RAID-5 volume, etc). If these disks (or LUNs) are presented from a SAN, most likely you can stripe across the same storage devices--making up these LUNs--inside the SAN to present ...
    Posted to Linchi Shea (Weblog) by Linchi Shea on March 12, 2007
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