Failure to Launch (was override -q option)

[Laurence Marks]

Thanks, a good suggestion. Which sshd daemon would this be? The jobs
are running with the local head node a diskless one which has between
8 and 12 cores, and the job is only starting 8 ssh connections.
However, it might be that other nodes are also starting ssh
connections at the same time.

N.B., I do not have read access to sshd_config so I have to ask for
that information (just did).

On Mon, Jul 22, 2013 at 8:41 AM, Gert Doering <gert at greenie.muc.de> wrote:
> Hi,
>
> On Mon, Jul 22, 2013 at 08:11:40AM -0500, Laurence Marks wrote:
>> It may be that I will need to run a number of similar jobs in parallel
>> which is tricky to setup reliably with a queueing system. One
>> question: is there any conceivable way if 10-20 tasks are all trying
>> to connect via ssh at the same time that there can be an issue? They
>
> There is a limit on the number of yet-unauthenticated ssh sessions that
> the server permits.
>
> sshd_config
>
>      MaxStartups
>              Specifies the maximum number of concurrent unauthenticated con-
>              nections to the SSH daemon.  Additional connections will be
>              dropped until authentication succeeds or the LoginGraceTime
>              expires for a connection.  The default is 10.
>
> this *might* be hitting you...
>
> gert
> --
> USENET is *not* the non-clickable part of WWW!
>                                                            //www.muc.de/~gert/
> Gert Doering - Munich, Germany                             gert at greenie.muc.de
> fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de



-- 
Professor Laurence Marks
Department of Materials Science and Engineering
Northwestern University
www.numis.northwestern.edu 1-847-491-3996
"Research is to see what everybody else has seen, and to think what
nobody else has thought"
Albert Szent-Gyorgi