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what are the default threshold values for Average disk bytes/write and Average disk bytes/read

    Question

  • Hi All,

    We are facing issue on Windows 2003 for which we have enabled the performance counters and captured the data collecter set, and we enabled the Average disk bytes/write and bytes/read counter and we captured the data and after some period we stoped that data and when converted in CSV format we are getting value like 12870.3044776119, so my question is this value are in sec or milliseconds and what is threshold for this counters means if the value goes beyond x no then there is some bottlenecks on server. Please suggest.......

    Regards,

    Sudhir


    Tuesday, December 11, 2012 5:25 PM

Answers

  • Hello,

    I think you are confounding "Avg. Disk Bytes/write" and "Avg. Disk sec/write"

    Avg. Disk Bytes/writes: Avg. Disk Bytes/Write is the average number of bytes transferred to the disk during write operations. => So the unit is here Bytes (8 bits)

    Avg. Disk sec/writes: Avg. Disk sec/Write is the average time, in seconds, of a write of data to the disk. => Here the unit is Second. You will have to multiply by 1000 to get millisecond.

    The table you give above is Avg. Disk Bytes/writes, nothing to do with time. I presume you want to look at Avg. Disk sec/writes instead.

    Regards


    Wednesday, December 12, 2012 4:08 PM

All replies

  • Hi Sudhir,

    The below technet article explains all the answers to your questions with that a complete detailed chapter on all Disk Counters and Detecting Disk Bottlenecks.

    http://technet.microsoft.com/en-us/library/cc722466.aspx

    I hope this solves your query. Please do mark as answer I redirected to your solution.

    Thanks,

    Deepak



    Tuesday, December 11, 2012 6:33 PM
  • Dear Deepak,

    Thanks for your reply, but still my query is not cleared we have a raw data and from which we need to identify that is there any bottleneck where we need to concentrate yes i have disk performance issue, from existing data can we say ok this value is high here it is should be not there. Kindly find some data mention below -

    Date \\xyz\PhysicalDisk(_Total)\Avg. Disk Bytes/Write
    11/29/2012 18:00:00.765  
    11/29/2012 18:00:15.781 12226.30126
    11/29/2012 18:00:30.781 13477.47645
    11/29/2012 18:00:45.781 22493.45858
    11/29/2012 18:01:00.781 35223.1811
    11/29/2012 18:01:15.781 9978.404372
    11/29/2012 18:01:30.781 33668.26667
    11/29/2012 18:01:45.781 7224.341128
    11/29/2012 18:02:00.781 5859.84
    11/29/2012 18:02:15.781 14720.92086
    11/29/2012 18:02:30.781 6761.627507
    11/29/2012 18:02:45.781 31613.85132
    11/29/2012 18:03:00.781 8929.802338
    11/29/2012 18:03:15.781 33965.51586
    11/29/2012 18:03:30.781 44771.86059
    11/29/2012 18:03:45.781 36041.8018
    11/29/2012 18:04:00.781 10021.64706
    11/29/2012 18:04:15.781 8957.502439
    Tuesday, December 11, 2012 6:46 PM
  • Hi Sudhir,

    The value of the Average disk bytes/write and bytes/read counter is collected based on your sample interval.

    You can change sample interval in Performance Monitor by right-click the graph panel and select 'Properties'. You can change the sample interval value in General Tab.

    According to your file, the interval should be 15 seconds. So your values are in every 15 seconds.


    Wednesday, December 12, 2012 5:30 AM
  • Thanks CommDev,

    But can you update me how can we calculate the from this data that during peak time there was disk performance issue, and some forums it says that average disk bytes/write should be not go beyond 20ms so how to calculate the data in millisecond.

    Wednesday, December 12, 2012 7:56 AM
  • Hello,

    I think you are confounding "Avg. Disk Bytes/write" and "Avg. Disk sec/write"

    Avg. Disk Bytes/writes: Avg. Disk Bytes/Write is the average number of bytes transferred to the disk during write operations. => So the unit is here Bytes (8 bits)

    Avg. Disk sec/writes: Avg. Disk sec/Write is the average time, in seconds, of a write of data to the disk. => Here the unit is Second. You will have to multiply by 1000 to get millisecond.

    The table you give above is Avg. Disk Bytes/writes, nothing to do with time. I presume you want to look at Avg. Disk sec/writes instead.

    Regards


    Wednesday, December 12, 2012 4:08 PM