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  • 1.  how to interpret % tm_act field in iostat output ?

    Posted Fri February 11, 2011 03:05 PM

    Originally posted by: JagdipSingh


    how to interpret % tm_act field in iostat output ?
    when i run just iostat, it shows high value for % tm_act for individual disks but when i run with iostat -m option; it shows % tm_act value of individual paths lot lower than disks.
    is tm_act value of disks sum of all path values ?

    for example see following output :

    1. iostat -d hdisk7 1

    Disks: % tm_act Kbps tps Kb_read Kb_wrtn
    hdisk7 57.0 2152.0 356.0 2140 12
    hdisk7 61.0 2024.0 339.0 2012 12
    hdisk7 74.0 1732.0 332.0 1732 0
    hdisk7 49.0 1484.0 280.0 1480 4
    1. iostat -m -d hdisk7 1

    Disks: % tm_act Kbps tps Kb_read Kb_wrtn
    hdisk7 76.0 512.0 89.0 508 4

    Paths: % tm_act Kbps tps Kb_read Kb_wrtn
    Path3 30.0 132.0 22.0 128 4
    Path2 34.0 96.0 22.0 96 0
    Path1 39.0 112.0 22.0 112 0
    Path0 31.0 172.0 23.0 172 0

    Disks: % tm_act Kbps tps Kb_read Kb_wrtn
    hdisk7 71.0 804.0 130.0 752 52

    Paths: % tm_act Kbps tps Kb_read Kb_wrtn
    Path3 28.0 272.0 33.0 260 12
    Path2 24.0 236.0 33.0 232 4
    Path1 27.0 200.0 33.0 188 12
    Path0 30.0 160.0 32.0 136 24
    #AIX-Forum


  • 2.  Re: how to interpret % tm_act field in iostat output ?

    Posted Fri February 11, 2011 03:36 PM

    Originally posted by: debbyhuang


    % tm_act Indicates the percentage of time the physical disk/tape was active (bandwidth utilization for the drive).
    #AIX-Forum


  • 3.  Re: how to interpret % tm_act field in iostat output ?

    Posted Fri February 11, 2011 03:40 PM

    Originally posted by: JagdipSingh


    thank you
    i was interested to know if tm_act value of paths or disks should be considered when dealing with MPIO
    #AIX-Forum


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