iostat statistics query

From: James (soul_kitchen_at_rediffmail.com)
Date: 06/04/04

  • Next message: Peter Saffrey: "Re: Debian release versions and apt" 
    Date: 4 Jun 2004 01:54:15 -0700

    Hi,

    On my redhat 7.3 (kernel 2.4.20-30.7 ) I am running iostat..

    When I run the command iostat it gives me following result..

    ---------------------------------
    Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
    dev3-0 35.36 3595.49 318.36 170535712 15099714
    dev3-1 55.35 2920.45 225.62 138518228 10701336
    ------------------

    When I run iostat -x the result are:

    ----------
    Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s
    avgrq-sz avgqu-sz await svctm %util
    /dev/hda 1652.45 35.17 30.73 4.56 3591.17 318.09 1795.59
    159.04 110.77 0.76 95.06 21.67 7.65
    /dev/hda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
        4.89 0.00 105.56 105.56 0.00
    /dev/hda2 0.00 0.94 0.56 0.45 4.50 11.29 2.25 5.64
       15.60 0.63 616.37 199.92 2.02
    /dev/hda3 32.48 34.23 4.43 4.11 295.24 306.80 147.62 153.40
       70.48 1.74 203.55 30.38 2.60
    /dev/hdb 1254.53 8.75 35.84 19.42 2916.99 225.69 1458.50
    112.84 56.87 1.11 193.32 14.59 8.06
    /dev/hdb1 0.38 4.87 0.42 14.54 6.39 155.34 3.20 77.67
       10.81 2.86 189.43 46.24 6.92
    /dev/hdb2 39.11 3.88 16.12 4.88 441.92 70.35 220.96 35.17
       24.39 7.03 328.38 75.15 15.78
    -------------

    Note the result of iostat -x command /dev/hda shows the rsec/s as
    3591.17 ... However the sum of rsec/s from /dev/hda1, /dev/hda2,
    /dev/hda3 is just about 300.. I am confused about where these extra
    reads coming from??
    The same behaviour is for /dev/hdb

    I am checking these because I am facing a strange problem with my mail
    server. It works normally for say around 24 hrs and then simply
    freezes within fraction of seconds. Then the only option i am left
    with is to reboot the server. The server is located in a remote
    location and I can only ping to it when this happens, everything else
    is freezed!!

    I will appreciate any kind of help.

    Thanks

  • Next message: Peter Saffrey: "Re: Debian release versions and apt"

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