On 2015-04-02 10:50 AM, Heitor Faria wrote:
>> I have a tape library with several LTO5 tape drives.  I have 3 tape pools and
>> a scratch pool.  Pool1 is quite large and has most of the jobs.  The jobs
>> are in a fairly standard, monthly FULL, weekly DIFFERENTIAL, and daily
>> INCREMENTAL schedule.  The FULL backups are fairly evenly divided across
>> 1st-4th Saturdays and are quite large (multiple TBs).  Pools 2 & 3 are
>> smaller as are the jobs.  The issue that I am trying to solve is to have at
>> least one tape drive available for Pools 2 & 3 that Pool1 doesn't use.
> Hello Patricia. IMHO there are two Bacula safe ways to write on multiple tabe 
> library drives at the same time:
>
> 1. Having Maximum Concurrent Jobs in each device on bacula-sd (probably is 
> what you have). If you want to avoid tape spreading just increase the maximum 
> value for each device to more than all Jobs submited to Pool1.
>
> 2. Don't using Maximum Concurrent Jobs but scheduling Jobs for different 
> pools at a given time.
>
>> It appears that the only way to do this is to use a different media type for
>> Pools 2 & 3 and for any of the tape drives that I want reserved.
> I don't linke using different media types for the same kind of media, but 
> it's my personal view.
>
>> Of course
>> this would mean that Pools 2 & 3 would not be able to share the Scratch
>> pool?  Is anyone using multiple scratch pools or is that possible?
> Never tested but seems possible. Of course the Scratch pools gotta have 
> unique names:
>
> Pool Resource (Bacula Manual):
>
> ScratchPool = pool-resource-name
> This directive permits to specify a dedicate Scratch for the current pool. 
> This pool will replace the special pool named Scrach for volume selection. 
> For more information about Scratch see Scratch PoolTheScratchPool section of 
> this manual. This is useful when using multiple storage sharing the same 
> mediatype or when you want to dedicate volumes to a particular set of pool.
>
>
Multiple scratch pools are no problem.  Just remember to set the correct 
RecyclePool settings in your Pool directive.

For your specific question around drives and keeping them reserved, you 
don't actually need multiple Scratch pools unless you want them.  The 
drive that will be used is not related to the original scratch pool the 
drive came from.

I think you could achieve what you are trying to do by using two Changer 
definitions.  Put some of the drives in one 'Changer' and the other 
drives in the other.  Then have your Pool definitions use the changer 
that contains the drives you want.

Bryn

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