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  1. #1
    3 Star Lounger
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    Avg. Disk Queue Length (Server 2003 Standard)

    Hi,

    I have a Windows 2003 server (in an NT domain) which is locking up for periods then returning to normal activity. It has around a hundred users and they experience lockups (significant delays in opening & saving documents) but I am told that it is only NT client users that experience the problem

    I have been running Performance Monitor on the system and it shows very high "Avg. Disk Queue Length" and it appears to happen at the same time as the delays. What's more I have had Task Manager running simultaneously and monitored CPU performance ... there is no corresponding rise in CPU activity.

    It therefore appears to be disk related so can anyone suggest anything that will bring this queue length down?

    Kyu

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  3. #2
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    Re: Avg. Disk Queue Length (Server 2003 Standard)

    "NT" users as in Windows NT? How many users? Do they have a large number of files open concurrently? Is this at a particular time of the day?

    Joe

  4. #3
    Plutonium Lounger Leif's Avatar
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    Re: Avg. Disk Queue Length (Server 2003 Standard)

    There seems a similar issue discussed here at Experts Exchange which may give you some clues.

    (Note: Don't accept their cookies, and scroll down to the very bottom to get the answers <img src=/S/wink.gif border=0 alt=wink width=15 height=15> )

  5. #4
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    Re: Avg. Disk Queue Length (Server 2003 Standard)

    Possible causes of a large disk queue are
    <UL><LI>Disk errors, causing retries
    <LI>Lots of I/O activity going to the same disk[/list]Have a look in the event log to see if you are getting any disk errors, and look at your performance counters to see how many I/O operations per second are going to the disk.

    StuartR

  6. #5
    Super Moderator BATcher's Avatar
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    Re: Avg. Disk Queue Length (Server 2003 Standard)

    I did an MSc thesis on 'Disk Scheduling Algorithms' which might have been of use here - but for the fact that this was on a long-defunct university variant of one of IBM's mainframe operating systems, and about 35 years ago...

    (The 'Michigan Terminal System' on the IBM 360/67, since you asked!)
    BATcher

    If it wasn't for the weather, Great Britain would be a silent nation.

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