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Thread: High Avg. Disk Queue Length in Performance Monitor

  1. #1
    Rich Guest

    High Avg. Disk Queue Length in Performance Monitor

    Hi Everyone,

    We have a web server set up running a single web site. The web site
    accesses a database on a seperate server. The web server has Windows Server
    2003 SP1 installed and has 2GB of RAM. We experienced a couple of timeout
    exceptions on the site yesterday so I started looking at the performance of
    the web server. I am not sure that this is responsible for the timeouts we
    are experiencing but I noticed that the Avg. Disk Queue Length in the
    performance monitor was up around the 2000 (with the maximum being somewhere
    around 26000).

    Having had a look around the web it seems that the average should be around
    2? On the database server this is the case. Can anyone suggest why this
    value would be so high?

    We have tried stopping the website and associated services but this didn't
    effect this value. We have also tried using RAMBooster to clear down the
    current RAM but it quickly returns to its previous state. Again, this made
    no difference to the number of writes to the disk.

    There is around 1.3GB of available RAM although this value does not
    fluctuate at all.

    Can anyone make any suggestions on what might be causing this or what steps
    I can take to identify the problem? I am extremely new to the server
    management process.

    Many Thanks

    Rich

  2. #2
    bg Guest

    Re: High Avg. Disk Queue Length in Performance Monitor

    On Mar 13, 5:10 am, Rich <R...@discussions.microsoft.com> wrote:
    > Hi Everyone,
    >
    > We have a web server set up running a single web site. The web site
    > accesses a database on a seperate server. The web server has Windows Server
    > 2003 SP1 installed and has 2GB of RAM. We experienced a couple of timeout
    > exceptions on the site yesterday so I started looking at the performance of
    > the web server. I am not sure that this is responsible for the timeouts we
    > are experiencing but I noticed that the Avg. Disk Queue Length in the
    > performance monitor was up around the 2000 (with the maximum being somewhere
    > around 26000).
    >
    > Having had a look around the web it seems that the average should be around
    > 2? On the database server this is the case. Can anyone suggest why this
    > value would be so high?
    >
    > We have tried stopping the website and associated services but this didn't
    > effect this value. We have also tried using RAMBooster to clear down the
    > current RAM but it quickly returns to its previous state. Again, this made
    > no difference to the number of writes to the disk.
    >
    > There is around 1.3GB of available RAM although this value does not
    > fluctuate at all.
    >
    > Can anyone make any suggestions on what might be causing this or what steps
    > I can take to identify the problem? I am extremely new to the server
    > management process.
    >
    > Many Thanks
    >
    > Rich


    What type of timeout was it? Could it have been a result of a
    database issue? What type of content are you expedting from the
    database server?
    What type of hardware are you running on the web server?

    What is the value of % Disk Time?


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