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How to tell if you are Disk IO bound

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  • How to tell if you are Disk IO bound

    I assume that the way you tell if your MYSQL server is CPU bound is by watching the cpu usage percentage in top or ps....but how do I tell if its Disk IO bound?

  • #2
    I normally check iostat -x and see % busy for disks.

    If load is IO bound one of more of them will be close to 100%

    You can also check iowait column in vmstat it shows time spent waited on IO

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