HP OpenVMS Systems

Duplicate batch job submissions?

» close window

The Question is:

 
I have a problem that one batch job will re-schedule itself's twice, so 2 batch
 jobs run the second night --- occassional another batch job will be spawned
 from these and so on.
 
I have other batch jobs that reschedule themselves with no problem.
 
Recommendations highly welcome.
 
Mark Greetham
Swisslog Software (UK)
 
 

The Answer is :

 
  You will need to find the source of the second (re)submission.
 
  It is possible that a sufficiently skewed set of system times within
  an OpenVMS Cluster configuration can permit a batch job to be started
  when its expected time arrives, and to be invoked on a cluster member
  node with an earlier time (and as the job then resubmits itself with
  an /AFTER=TOMORROW from the perspective of the system with the slower
  system time) and the resubmitted job is then immediately triggered (by
  the system with the later time).
 
  One simple technique to avoid this is to issue a wait in the procedure
  for an interval that is longer than the largest expected time skew, then
  the procedure can resubmit itself for the next run.
 
  Alternatively, use DTSS or NTP or similar tool to maintain the cluster
  time -- see the OpenVMS FAQ for details.
 
  If the above discussion does not address your environment -- if this
  is not an OpenVMS Cluster configuration -- then please contact the
  Compaq Customer Support Center with additional details of the
  configuration and the errant procedure resubmissions.  Expect to be
  asked for details of the DCL procedure and the resubmission, as well
  as information from the system accounting logs.
 

  

     

     
answer written or last revised on ( 1-DEC-2000 )
     
» close window