TOP reports High iowait

[David Tonhofer, m-plify S.A.]

Like they say in that old short story "The Final Question":

"Not enough data for meaningful answer"

...but could it be swapping?

Try these man pages and commands: free, vmstat, also check /proc/meminfo

The vmstat output is very informative:

procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 0  0 2912748 165736  97384 414396    5    4    74   124    3     1  9  2 89  1

where

si/so are blocks swapped in and out
bi/bo are blocks moved in and out (AFAIK, only those not swapped)


-- David

--On Thursday, March 31, 2005 4:58 PM -0400 Yezid Mendoza Jimenez <yezidmj at cantv.net> wrote:

>
> Hi team,
>
> My server running RedHat Enterprise 3.0 is getting slow two days ago. When I
> check performance I can see the value of iowait around 80% - 95%, when my
> server is on these values it gets slow to serve web sites and other services
> like sendmail. Any idea about this issue?
> Server: Dell PowerEdge 750, P-IV, 2.8Ghz, 1Gb RAM, % disk: 13 - 16%
> RedHat ES 3.0. Sendmail, MySQL, Apache running virtual hosting. ALl of these
> are defaults versions on RedHat ES 3.0
>
> I hope you can give an idea about this.
>
> Best Regards,
> Yezid Mendoza.
>
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