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% Disk Time vs Disk Reads/sec + Disk Writes/sec

  • May 18, 2005 at 9:43 am

    #186043

    Hi there,

    If I am capturingDisk Reads/sec + Disk Writes/sec (on Total basis), why do I need % Disk Time_Total counter?

    Is there a real benifit to this?

     

    Thanks for suggestions

     

  • May 19, 2005 at 9:11 am

    #559870

    Not if you known the thruput capabilities of the disk sub-system, which is almost never known.

    Personnaly, I never bother with Disk Reads/sec or Disk Writes/sec but only collect "%Disk Time", "%Disk Read Time" and "%Disk Write Time" for each drive, not in total. If disk time is greater than 80%, then I know that the disk system needs to be investigated and start looking at "current disk queue length".

    SQL = Scarcely Qualifies as a Language

  • May 19, 2005 at 12:26 pm

    #559978

    Carl, two questions:

    By "thruput capabilities of the disk" do you mean I/O capacity for the drives, like 100 I/O/sec?

     

    Also, why do you look at individual disks, what if you have RAID or SAN subsystem?

     

    Thanks

     

     

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