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high load average, no cpu or ram usage

Discussion in 'General Discussion' started by bangsters, Aug 21, 2009.

  1. bangsters

    bangsters Well-Known Member

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    Hey,

    I was comparing servers, and I noticed that 2 of my servers running whm are constantly around 7-15 load average eventhough cpu usage is close to none. There is not much RAM usage and swap is unused. I have checked processes, and out of around 200, 1-5 are running, with 1 zombie, and the rest sleeping. iowait varies from 5% to 40% (sometimes spikes to 50%) but even on low iowait the load average still sits at 8.

    The servers are both 2 x dual cores with 8GB RAM running latest whm on centos 32bit platform. A similar setup with only 4GB on another box produces around 1.5load all day, which is puzzling.

    Any suggestions? I compared httpd.conf, my.cnf, and even easyapache compilation and both servers are near identical in setup. I can't think of any other avenue to check.
     
  2. keddie

    keddie Well-Known Member

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    I've just been dealing with a similar issue on my dedi. If CPU and RAM are looking OK then you might have an IO / disk issue.

    I would recommend installing the Sysstat suite of resource monitoring tools:

    yum install sysstat

    which will install iostat and some other handy scripts.

    I started a thread on this subject over on linuxquestions.org and got some really good help and advice:

    Troubleshooting high load - Possible IO / RAID issue? - LinuxQuestions.org

    This link outlined the tools availble for diagnosing load issues on centos / RHL:

    Red Hat Enterprise Linux-Specific Information


    These links also helped me get to grips with iostat:

    iostat and disk utilization monitoring nirvana
    Eric Bergen » The difference between %iowait from sar and %util from iostat

    Let me know how you get on.

    Ked
     
  3. bangsters

    bangsters Well-Known Member

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    Thanks for the link. WHen you were having the same issue, what was the average IO you were getting? Our IO varies anywhere from 2% to 50%. However, load avegare still shows around 5-6 even if the io is very low.

    We already have systat and use it as well, but thanks for the info :) I'll read over the links you sent over.

    Thanks again!
     
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