[Bacula-devel] Re: [Bacula-users] Scratch pool

[Kern S. <ke...@si...>]

Hello Ludovic,

Thank you for your response. With these specifications, the idea is much
more appealing to me.  Below, I suggest a possible different way of
specifying a Scratch Pool ...

On Fri, 2003-11-28 at 12:15, Ludovic Strappazon wrote:
> Here how I consider the thing :
> 
> Kern Sibbald wrote:
> 
> >On Fri, 2003-11-28 at 10:02, Ludovic Strappazon wrote:
> >  
> >
> >>Hello Kern,
> >>
> >>Few months ago, we have discuss about the scratch pool,  I think this is 
> >>one of the (rare) features which lacks to Bacula. Did you think about it ?
> >>    
> >>
> >
> >Hello Ludovic,
> >
> >Yes, I remember your request.  I made the following notation in my todo
> >list:
> >
> >- Scratch Pool where the volumes can be re-assigned to any Pool.
> >
> >but I haven't thought about it much. I did think that I can use the Pool
> >type to indicate scratch Pools, but at the moment, none of the code
> >really checks pool types.
> >
> >Your request did prompt me to add "update pool" allowing the user to
> >change the pool.
> >
> >I'll be happy to up the priority of this if I can have the following
> >things:
> >
> >1. Some precise input from you and anyone else interested in *exactly*
> >where in the current "Recycling Algorithm" Bacula should search for
> >volumes in the scratch pool.  See:
> >
> >http://www.bacula.org/html-manual/recycling.html#Recycling
> >
> >  
> >
>     * Search the Pool for a Volume with VolStatus=Append (if there is
>       more than one, the Volume with the lowest MediaId is chosen)
>     * Search the Pool for a Volume with VolStatus=Recycle (if there is
>       more than one, the Volume with the lowest MediaId is chosen)
>     * Prune volumes applying Volume retention period (Volumes with
>       VolStatus Full, Used, or Append are pruned)
>     * Search the Pool for a Volume with VolStatus=Purged
>     * Attempt to create a new Volume if automatic labeling enabled
>     * Prune the oldest Volume if RecycleOldestVolume=yes (the Volume
>       with the oldest LastWritten date and VolStatus equal to Full,
>       Recycle, Purged, Used, or Append is chosen). This record ensures
>       that all retention periods are properly respected.
>     * Purge the oldest Volume if PurgeOldestVolume=yes (the Volume with
>       the oldest LastWritten date and VolStatus equal to Full, Recycle,
>       Purged, Used, or Append is chosen). We strongly recommend against
>       the use of *PurgeOldestVolume* as it can quite easily lead to loss
>       of current backup data.
>     * *Search the Scratch pool for a Volume if using Scratch Pool
>       enabled and create a new Volume**.*
>     * Give up and ask operator
> 
> >2. What does Bacula do if there are two scratch Pools?  This could be
> >simplified by requiring the Pool Name to be Scratch rather than the Pool
> >type, but that seems rather limited.
> >  
> >
> I think there should be only one Scratch pool ( or one for each type of 
> media ? ), eventually replacing the Default pool. This pool would be 
> only a common reserve of Volumes for all the other pools. The pool 
> ressource could contain a new record :
> 
> *UseScratchPool = <yes/no>*
>     This record specifies if Bacula is authorized to pick a Volume from
>     the Scratch Pool and add it in this pool.

How about:

  UseScratchPool = <pool-name>  
    where the Pool Type must be Scratch.

> 
> Advantages : 
> 
>     * When you install Bacula, you create your pools, and put all your
>       volumes in the scratch pool
>     * With Bacula running, you just have to verify that the scratch pool
>       is not empty.

      * You can have different Scratch Pools that feed different Pools.
> 
> *RecycleInScratchPool = <yes/no>
>           *This record specifies if a purged Volume stays in his pool, 
> or joins the scratch pool.

How about:

  RecycleToPool = <pool-name>
     Where the Pool Type must be Scratch.

Best regards,

Kern


> 
> **
> 
> >3. Someone else would like this feature.
> >
> >Even if I don't get all the items above, I will definitely implement it,
> >is is just a question of getting the answer to (or deciding what to) do
> >for the first two questions, and setting a priority.
> >
> >Best regards,
> >
> >Kern
> >
> >
> >
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