arla , krb and ntp

[Esther Filderman]

> The second question is :
> if one user has a ticket on one computer to cern.ch (for ex) and submittes
> a job using LSF or PVM ( that looks for available computer that can be
> different from the one with afs ticket) , how this user can take files
> from afs without doing klog on the second computer on which LSF runs his
> job.

I believe some queueing systems are AFS aware.  Try NQS or PBS.  I think they
are able to "pass along" an AFS token.  

> The third question is what happens if the time for a job exeedes the time
> of the ticket ?

Exactly what you think -- the data being written cannot finish and, if
applicable, files cannot be read.

For this reason, users running large batch jobs often require high expire time
on their tokens.  However, it's important to realize the security implications
of a token that's active for, say, 250 hours.

e.
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     ecf at psc.edu     Esther Filderman    moose+ at cmu.edu
        Senior System Mangler, News & AFS Dominatrix  
               Pittsburgh Supercomputing Center