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Cpu problem: high iowait

Discussion in 'General Discussion' started by fchx, Jun 24, 2008.

  1. fchx

    fchx Member

    Nov 11, 2004
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    Last weeks, we have detected that the POP3 service is restarted frecuently by the chkservd service.

    After install the munin graphs to investigate, we have detected that in the graphic of the CPU, the iowait is very hight (about 100% over 200%)

    - We have upgraded our ram from 1 to 2Gb
    - We have checked the RAID1 disks, it seems there isn't problems here
    - We have trying to tune the courier-imap's values (up and down)
    - Network graph seems to be ok

    Nothing works, the iowait is still hight.

    (The rest of the services seems that works fine)

    Any idea ?????

    Our server info:

    - Intel(R) Pentium(R) D CPU 3.00GHz
    - 2Gb RAM
    - RAID1 by hardware (2x220Gb)
    - WHM 11.15.0 cPanel 11.18.3-S21703
    - CENTOS Enterprise 4.6 i686 on standard - WHM X v3.1.0
    - Linux kernel 2.6.9-55.0.2.ELsmp
    #1 fchx, Jun 24, 2008
    Last edited: Jun 24, 2008
  2. chirpy

    chirpy Well-Known Member

    Jun 15, 2002
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    Go on, have a guess
    High IOWAIT usually means that you have a disk hungry process running. Are the backups running when you're seeing high IOWAIT? Have you checked top and the ps list incase there are any looping processes?

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