On Thu, May 1, 2008 at 8:22 AM, Mikael Kermorgant
<mikael.kermorgant AT gmail DOT com> wrote:
>
>
>
> On Wed, Apr 30, 2008 at 9:40 PM, John Drescher <drescherjm AT gmail DOT com> 
> wrote:
> >
> > >  One thing I'm having a hard time understanding. Can jobs run
> concurrently
> > >  (backup 25 servers at a time) to the same volume?
> >
> > Yes. You set this with the maximum concurrent jobs setting. Note you
> > may need to set this in 5 or more places in your configs depending on
> > the level of concurrency you want.
> >
> >
> > >
> > > Or is it suggested that
> > >  each job/client backup to its own volume?
> > >
> > Its better to not do that.
> >
>
> Hello,
>
> I'm curious to know why because I used to have this type of configuration in
> a disk based backup.

Mainly Recycling. If you want recycling to work correctly you will
need at least 2 volumes for every client. Remember a volume is always
recycled in its entirety.  For tapes this becomes very inefficient in
terms of tape utilization and user interaction. For disk there should
not be a problem with doing this.

Then if you try to solve this and limit the backup to only 1 volume
per client you open up a large can of worms. Recycling with only 1
volume you will have no valid backups for the client being backed up
just after the recycle occurs. Automatic pruning does not work well
because the last update to the volume is usually the last backup. What
happens if the current backup will not fit on the rest of the tape?

John

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