[Bacula-users] feature request: exempt administrative connections from c

Item 1:   Administrative connections to the file daemon should not count in the 
concurrency limit
  Origin: Mark Bergman <mark.bergman AT uphs.upenn DOT edu>
  Date:   Wed Nov 30 18:03:20 EST 2011
  Status:

  What:   
         Administrative connections to the file daemon should not count
         in the concurrency limit.

         These connections to the file daemon (ie., "stat dir" or "cancel
         dir") are treated as if they were backup connections. This means
         that these commands will be refused if the maximum number of
         concurrent jobs are running.

  Why:    
         The file daemon may be configued with a low concurrency
         value to deliberately prevent multiple backups from running
         simultaneously. Use of a low value is especially important
         in an enterprise setting, where a bacula client may be a file
         server with large disk volumes that should not be backed up
         concurrently to avoid I/O contention on the file server.

         If "Maximum Concurrent Jobs" is set to "1", then all other
         connections to the file daemon will be refused, including
         administrative commands.

         Setting the concurrency value to another low value (ie., 2,
         3, etc.) both defeats the purpose of limiting I/O contention
         and actually makes the problem worse. As soon as the maximum
         number of backups (the concurrency limit) are running, then
         it becomes impossible to cancel any of the jobs--exactly at a
         time when I/O or network contention become a problem and some
         of the jobs should be canceled.


  Notes: A similar issue may exist for the other concurrency
         limits applied to the director and storage daemon.

----
Mark Bergman                              voice: 215-662-7310
mark.bergman AT uphs.upenn DOT edu                 fax: 215-614-0266
System Administrator     Section of Biomedical Image Analysis
Department of Radiology            University of Pennsylvania
      PGP Key: https://www.rad.upenn.edu/sbia/bergman 

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[Bacula-users] feature request: exempt administrative connections from concurrency limits
