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maxphys - Sun Solaris

I did an I/O test on a Solaris8 box, which had the maxphys set to 128K adb -k physmem 778b0 maxphys/D maxphys: maxphys: 131072 but one of the test seems to do I/O size greater than 128K (close to 1M ), any idea what is causing this? r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 68.0 0.2 69633.6 0.2 0.0 3.6 0.0 52.4 0 91 0.0 67.0 0.0 68405.0 0.0 7.2 0.0 107.4 0 100 I did a VxVM volume level copy between two volumes. Please let me know if I need to post any other information. ...

  1. #1

    Default maxphys

    I did an I/O test on a Solaris8 box, which had the maxphys set to 128K

    adb -k
    physmem 778b0
    maxphys/D
    maxphys:
    maxphys: 131072

    but one of the test seems to do I/O size greater than 128K (close to
    1M ), any idea what is causing this?

    r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device

    68.0 0.2 69633.6 0.2 0.0 3.6 0.0 52.4 0 91

    0.0 67.0 0.0 68405.0 0.0 7.2 0.0 107.4 0 100

    I did a VxVM volume level copy between two volumes. Please let me know
    if I need to post any other information.

    Thanks
    SN
    star Guest

  2. #2

    Default Re: maxphys

    star night wrote: 

    VXVM has its own tunable "vol_maxio"
    Its default value is a Megabyte in VXVM 3.5

    --
    ================================================== ======
    Lars Tunkrans
    smtp: lars dot tunkrans at bredband dot net
    --------------------------------------------------------

    Lars Guest

  3. #3

    Default Re: maxphys

    Lars Tunkrans <net> wrote in message news:<CT3cb.119967$bredband.com>... 
    >
    > VXVM has its own tunable "vol_maxio"
    > Its default value is a Megabyte in VXVM 3.5[/ref]


    doesn't the sd driver(or ssd) the lowest layer in the I/O stack,
    hence, shoudn't all the I/O size be limited by "maxphys". I understand
    that the iostat counters are being updated at the sd/ssd driver level.

    Thanks
    SN
    star Guest

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