Vivek J. Patankar wrote:
> I have an IBM Thinkcentre with a RHEL5.1 client installation fully
> updated. The system runs on init level 3. Gnome/KDE package groups are
> not installed. The package groups installed are Administration Tools,
> Editors, System Tools, Text Based Internet & Server Configuration
> Tools. This system has Nessus-3.0.6 installed using the rpm acquired
> from nessus.org.
>
> The problem is this... the system slows to a crawl after random time
> durations. Trying to login via ssh from a remote system takes up to 5
> minutes and a Vulnerability Scan of a subnet with 60-70 systems is
> known to take a day! The usual time for this job is less than 10
> minutes. If I reboot the system things go smoothly for anywhere
> between 30 minutes and 2 hours before slowing down again.
>
> I went through the kernel messages log but no errors or hints to the
> problem were found. I even created a *.* entry in syslog.conf to
> capture all possible logs into one /megalog/ but found nothing out of
> place.
>
> I don't suspect any problems in the hardware as until last week this
> system was doing the same task running Fedora 8. No performance issues
> seen then.
>
> Any pointers? What else should I look at?
>
do you have any hardware monitoring? ie cpu fans etc.

I've seen servers go slow when the cpu fan slows/sticks/dies, and even
with dodgy power supplies, i'd check voltages and fan speeds if you can.

if your definitely sure it's not hardware then its time to look through
the package differences between the two distros and the kernel change
log in case its a bug fix that redhat haven't patched yet.

hopefully that's a point in the right direction for you.

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