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Thread: strange iozone result

  1. #1
    Join Date
    Mar 2012
    Posts
    2

    Default strange iozone result

    Hi

    Using pts 3.8 I got some strange iozone results when testing the read performace.

    Choosing the 4Kb record size option iozone reported that the average read performance was 1000 MB/s.
    When the record size was bigger then the average result was 30 MB/s.

    /System info: 80 GB Seagate ST98823A, Linux 3.2.11, encrypted ext3/

    My question is why did iozone show obviously bad results when choosing the smallest record size?

  2. #2

    Default

    For IOzone you should be using a write/read size at least twice the RAM capacity.

  3. #3
    Join Date
    Mar 2012
    Posts
    2

    Default

    I have 2GB ram so I set the file size to 4GB, now the results are between the expected range.

    Thanks Michael.

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