[torqueusers] Force a job to rerun after mom has crashed
knielson at adaptivecomputing.com
Wed Aug 24 17:27:22 MDT 2011
----- Original Message -----
> From: "Gus Correa" <gus at ldeo.columbia.edu>
> To: "Torque Users Mailing List" <torqueusers at supercluster.org>
> Sent: Wednesday, August 24, 2011 4:52:32 PM
> Subject: Re: [torqueusers] Force a job to rerun after mom has crashed
> Lloyd Brown wrote:
> > Ken,
> > Can you clarify this statement for me? We frequently take nodes
> > offline
> > (pbsnodes -o nodename), when some sort of hardware fault occurs,
> > detected outside of Torque/Moab. The pbs_mom is still responsive to
> > queries, etc., but the scheduler considers it down, and won't
> > schedule
> > anything to it, the node drains, etc., and then we can work on the
> > node,
> > and bring it back online. I don't see what the problem would be.
> > Unless by "taken offline", you are saying that the pbs_mom is not
> > responsive anymore for some reason (node has kernel panic'd; network
> > cable unplugged; inexperienced admin messes up iptables; etc.) That
> > I
> > could see.
> > Lloyd Brown
> > Systems Administrator
> > Fulton Supercomputing Lab
> > Brigham Young University
> > http://marylou.byu.edu
> > On 08/24/2011 04:03 PM, Ken Nielson wrote:
> >>> The node has been taken offline by the administrator for testing.
> >>>> David
> >> Not a good practice with MOMs running jobs.
> > _______________________________________________
> Hi All
> I was also surprised by that statement.
> Like Lloyd, I've been blindly trusting "pbsnodes -o" as a handy tool
> to service nodes graciously, after any ongoing jobs finish.
> After all, the pbsnodes man page says:
> -o Add the OFFLINE state. This is different from being
> marked DOWN. OFFLINE prevents new jobs from running on
> the specified nodes. This gives the administrator a
> tool to hold a node out of service without changing any-
> thing else. The OFFLINE state will never be set or
> cleared automatically by pbs_server; it is purely for
> the manager or operator.
> Is there anything wrong with this practice?
> Many thanks,
> Gus Correa
This may be my misunderstanding. This thread started with the crash of a MOM and so I was still thinking in terms of a crashed or downed MOM node. As far as setting a node to offline any running jobs will continue to run. If the offline is cleared on the node the job will still continue to run uninterrupted.
Sorry for any confusion.
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