Re: [Bacula-users] Scratch pool

[Ludovic S. <str...@um...>]

Here how I consider the thing :

Kern Sibbald wrote:

>On Fri, 2003-11-28 at 10:02, Ludovic Strappazon wrote:
> =20
>
>>Hello Kern,
>>
>>Few months ago, we have discuss about the scratch pool,  I think this i=
s=20
>>one of the (rare) features which lacks to Bacula. Did you think about i=
t ?
>>   =20
>>
>
>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
>
> =20
>
    * Search the Pool for a Volume with VolStatus=3DAppend (if there is
      more than one, the Volume with the lowest MediaId is chosen)
    * Search the Pool for a Volume with VolStatus=3DRecycle (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=3DPurged
    * Attempt to create a new Volume if automatic labeling enabled
    * Prune the oldest Volume if RecycleOldestVolume=3Dyes (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=3Dyes (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.
> =20
>
I think there should be only one Scratch pool ( or one for each type of=20
media ? ), eventually replacing the Default pool. This pool would be=20
only a common reserve of Volumes for all the other pools. The pool=20
ressource could contain a new record :

*UseScratchPool =3D <yes/no>*
    This record specifies if Bacula is authorized to pick a Volume from
    the Scratch Pool and add it in this pool.

Advantages :=20

    * 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.

*RecycleInScratchPool =3D <yes/no>
          *This record specifies if a purged Volume stays in his pool,=20
or joins the scratch pool.

**

>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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> =20
>

--=20
Ludovic Strappazon.

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