head node has an extremely high load average.

[Yixin Luo]

NO job from users should be allowed to run on the headnode.


On Thu, Jun 27, 2013 at 8:48 AM, Doll, Margaret Ann <margaret_doll at brown.edu
> wrote:

> Thanks.  This sounds like what I need.
>
> On Thu, Jun 27, 2013 at 9:44 AM, Miner, Jonathan W (US SSA) <
> jonathan.w.miner at baesystems.com> wrote:
>
> >
> > > How does one determine from which node the massive io requests are
> > coming?
> >
> > This falls under network monitoring.  You could use a program like
> > "iptraf"; if you run it on the server you should be able to get it to
> > display bytes per client, etc.
> >
> > Or if your switches have snmp monitoring, you could use mrtg to graph the
> > per port usage.  Assuming that each port maps to a single device, then
> > you'd be able to map high usage back to the client machine.  You could
> also
> > use a snmp monitoring program (Nagios is one...)  to actively alert you
> if
> > usage was above a certain threshold.
> >
> > https://fedorahosted.org/iptraf-ng/
> > http://oss.oetiker.ch/mrtg/
> > http://www.nagios.org/
> >
> > - Jon
> >
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