Les Mikesell wrote at about 10:23:10 -0500 on Wednesday, June 10, 2009:
 > John Rouillard wrote:
 > > On Sat, May 30, 2009 at 10:16:33PM +0200, Pieter Wuille wrote:
 > >> I don't know how common this usage is, but in our setup we have a lot of
 > >> backuppc "hosts" that are physically located on a few machines only. It
 > >> would be nice if it were possible to allow hosts on different machines to
 > >> be backupped simultaneously, but prevent simultaneous backups(dumps) of
 > >> hosts on the same machine.
 > >>
 > >> Any thoughts?
 > > 
 > > If you have a way of mapping the host names to a physical machine, you
 > > can use my queing/locking strategy described in:
 > > 
 > > 
 > >   http://www.mail-archive.com/backuppc-users AT lists.sourceforge DOT 
 > > net/msg13698.html
 > > 
 > > Create one queue/semaphore per physical machine and have the
 > > $Conf{DumpPreUserCmd} command exit with an error if it can't get a
 > > slot/lock (also you will have to set $Conf{UserCmdCheckStatus} = 1;).
 > 
 > As a feature request, I think it would be nice to have a way to add 
 > hosts to groups, then limit how many in each group the scheduler would 
 > start at once.  There are several scenarios where this is needed to 
 > avoid overloading some common reasource - like a low-bandwidth link as 
 > well as sharing a physical host or filesystem.
 > 

I think the notion of host groups is a good idea. Even more generally,
it would be nice to be able to define config files at the group level
rather than the current choice between the default config.pl file and
host-specific config files.

For example, this would allow one to define a config file for Linux
vs. Windows machines or for desktops vs. notebooks or for critical
machines vs. less critical machines (I know you can currently do this
in a kludgey fashion using links or by adding perl code to the config
file but it would be nice to have a better way to do it).

This generalization of host groups could easily include the notion of
maximum simultaneous group backups to run.

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