Re: High load average mail server 5.3-RELEASE

From: Francisco Reyes (lists_at_natserv.com)
Date: 09/23/05

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    Date: Thu, 22 Sep 2005 21:46:43 -0400 (EDT)
To: mariano benedettini <marianobe@gmx.net>

    On Tue, 13 Sep 2005, mariano benedettini wrote:

    >91.3% idle

    CPU is not the problem. :-)

    > Mem: 1599M Active, 1704M Inact, 311M Wired, 189M Cache, 112M Buf, 14M Free
    > Swap: 2023M Total, 184K Used, 2023M Free

    Swap is not the problem.

    Do
    vmstat 10

    Watch the output.
    In particular look at the first 3 columns.
      procs
      r b w
      1 1 0
      0 1 0
      1 1 0

    The left most column is CPU, the second column is disk IO.

    If you have a number in the "b" column and it never hits 0 you have an I/O
    problem. You HDs are not catching up.

    If you are using NFS and the "b" colun is not high and hits 0 some/all the
    time then the bottleneck is either the nfs connection or the nfs server.

    For example I have some servers that the "b" column would be between 20
    and 60 for a while. I am currently working on removing some of the load of
    the machine. In my case more memory would help, but the computer vendor we
    bought the machine from has sent us the wrong memory 3 TIMES!!
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