On Thu, Jan 27, 2011 at 12:26 PM, Phil Stracchino <alaric AT metrocast DOT net> 
wrote:
> On 01/27/11 06:12, Graham Keeling wrote:
>> Perhaps 10GB becomes more reasonable if you allow more than one job per 
>> volume,
>> but then you still have the problem of disk space being wasted because you
>> cannot purge the volume until the last small 1MB job passes its retention 
>> time.
>>
>> I think this last problem is what Phil is trying to solve by setting either
>> Maximum Volume Jobs or Volume Use Duration. But these solutions seem
>> unsatisfactory for disks (I can't comment on tapes because I don't know 
>> enough
>> about them).
>> You are wasting space if the volume is not full up by the time Volume Use
>> Duration expires.
>
> Define "full".  Disk volumes aren't like packing crates.  They're more
> like balloons.  They grow as you add data to them.
>
>> And you are wasting space if the volume is not full up with Maximum Volume
>> Jobs.
>
> Again, how is it "wasting space"?  A disk volume doesn't preallocate
> space to hold the maximum size of the number of jobs you might write
> into it.  A disk volume consumes only as much space as the data you
> wrote into it.

If i set Maximum Volume Bytes = 10GB then it uses the full 10GB at the
very first run as full-backup. But the increments later get always
written to new Volume Files. E.g.
Volume-0001: 10GB (from full run)
Volume-0002: 10GB (from full run)
Volume-0003: 10GB (from full run)
Volume-0004: 126MB (from full run)
Volume-0004: 7MB (incremental run later on...)

I would have expected, that it would ALWAYS append to my volume until
it reaches its "Maximum Volume Bytes" (here 10GB) limit.

Again, here is my Pool Definition:

Pool {
 Name = File
 Pool Type = Backup
 Recycle = yes                       # Bacula can automatically recycle Volumes
 AutoPrune = yes                     # Prune expired volumes
 Volume Retention = 14 days
 Maximum Volume Bytes = 10GB
 Maximum Volumes = 500
 Label Format = "Volume-"

}



Thanks a lot,
Mario


>
>
> --
>  Phil Stracchino, CDK#2     DoD#299792458     ICBM: 43.5607, -71.355
>  alaric AT caerllewys DOT net   alaric AT metrocast DOT net   phil AT 
> co.ordinate DOT org
>         Renaissance Man, Unix ronin, Perl hacker, Free Stater
>                 It's not the years, it's the mileage.
>
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