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Former Member

CPU I/O wait percentage

Hi All,

Today in our Production Server CPU I/O wait % is showing high value(ST06) ,what could be the reason behind this.



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1 Answer

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    Former Member
    Sep 18, 2008 at 11:52 AM


    Are you monitoring the I/O utilisation through any monitoring tool on OS level, if yes please discuss this with your H/W vendor if any H/W bottleneck he found if not then

    please proceed as below.

    A high I/O wait time occurs when accessing external files, or as as result

    network time (RFC/CPIC).

    Go to ST06>Detail Analysis Menu>Disk and check wether the Disk utilization are spread across all disks or not??

    Then go back and check under Top CPU option wether any long running programe found

    in the system and try to analyse why its taking mor time.

    Again in the same Detail Analysis screen go to the display within server botton and check

    the CPU ideal %ge is more than 70% or not...

    If everything looks fine then i would say there is no CPU bottleneck..

    From ST03N/ST03 screen also you could findout wether the CPU time is high or not?

    And lastly i would suggest to implement the Oracle 10g parameters (if you are using)should help since CPU time is also required for DB access time.

    Please let me know if anything unclear.

    Thank you,


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