SQL Server Performance

RAID 10::Avg. Disk Queue Length

Discussion in 'SQL Server 2005 Performance Tuning for Hardware' started by vg15, Jan 25, 2007.

  1. vg15 New Member


    Dell PowerEdge 2950
    Windows 2003 R2
    SQL 2005 w/ SP1
    6 - 146GB 15k RPM SAS Hard drives configured in a RAID 10 on a Perc 5/i controller.
    4GB Memory

    When running some benchmarks against the SQL server, the avg. disk queue length goes from 0 to as high as 70 (usually hanging from the 0-20 range). With 3 disks RAID 0, the measurement should be 6 or less. What is the cause of this? The hard drives can't go any faster, so would it be getting a better RAID controller instead of the PERC 5/i and if so, which one?

    Thoughts ?
  2. Luis Martin Moderator

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