Item 1: Administrative connections to the file daemon should not count in the
concurrency limit
Origin: Mark Bergman <mark.berg...@uphs.upenn.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.berg...@uphs.upenn.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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