[GE users] How delete unused host
Andreas.Haas at Sun.COM
Tue Jan 10 14:39:12 GMT 2006
On Fri, 6 Jan 2006, Marcel Mohr wrote:
> I'm a new user of SGE in a small (8Computer) Cluster environment, with
> network booting clients. It
> works, but as I try to be perfect (;-) ) there are some small things, that
> could be improved.
> Main concern
> I cant get a host out of the queue. The host is not existing anymore, if i
> try do delete the host i get
> "Host object "david001.ltsp" is still
> referenced in cluster queue "s"."
> Even with a restart it is still there.
this is due to host specific cluster queue settings. Before you can
remove a host from a hostgroup used a cluster queue it is required
you purge host specific settings in order to prevent configuration
trash remain in Grid Engine set-ups.
Luckily since 6.0u4 there is a qconf -purge switch that allows you
to remove host specific cluster queue settings in a very convenient
fashion. Since -purge option wasn't orderly documented before 6.0u7
it might be necessary to use
as preliminary documentation.
> Besides i got some other questions:
> 1.) Is it possible to increase the column size for some values (esp.
> JobName and Queue) in qstat and qmon ?
Unfortunately no - with qmon. With qstat we do have a workaround to
adjust queue names (see "SGE_LONG_QNAMES" in qstat(1)), but AFAICT
not for the job name. We dream since very long time of having a flexible
means to allow admins provide default output formats for the users, but
haven't found time to work on this until now :-(
> 2.) The host with qmaster running is a NFS Server for all exec hosts. Not
> only therefore i want this one, to be the last computer, on which jobs
> should be run.
> What would be the easiest way to achieve this. I tried to reduce cpu
> scaling, but that didn't solve it.
For specifing fix dispatch order the cluster queue sequence number
(see "seq_no" in queue_conf(5)) is used. In your case you must override
the sequence number for your masterhost
if you specify the scheduler shall primarily do queue sorting sequence based
you can be sure sequence numbers are considered irrespective of the current
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