On Mon, Dec 15, 2008 at 09:52:39PM +0100, Kern Sibbald wrote:
> Hello,
>
> I've been discussing with Eric how we might handle Copy jobs in our
> development version. Currently, Copy jobs are implemented, and they work
> much like Migration jobs (share 99% of the code). The difference is that
> Migration jobs purge the original backup job and keep only the Migrated data.
>
> With a Copy Job, the original backup job remains and there is a
> second "identical" job that contains the copied data. The only difference
> between the original and the Copy job is that they will be in different
> Pools.
>
> Now this poses a few problems for doing restores such as:
>
> 1. It is possible that a simple restore will choose JobIds from both the
> original and the Copy Job.
>
> 2. There is no easy mechanism for the user to select whether he/she wants to
> restore from the original backup or the Copy (or Copies).
>
> So for the moment, the situation is not really satisfactory (one of the
> reasons the code is not yet released).
>
> We have a number of ideas for different ways to solve the above problems,
> many
> have already been discussed on the mailing lists, and we will probably
> implement a number of the ideas put forward, either before or after the
> release (depending on the time we have and the complexity of the proposal --
> e.g. using the Location table and Costs ...).
>
> A few things seem obvious:
>
> 1. Any restore where Bacula automatically selects the jobs to be restored
> (e.g. a restore to the current state -- #5 on the restore prompt menu) should
> be done by default using the original backups.
>
.. if they're still available.
I'm using Bacula to backup to disk, and then after the backup-to-disk job I
copy from disk
volumes to tapes.
Backups are stored on disk volumes for X days, and after that disk volumes are
recycled/reused.
Backups are stored on tapes for much longer time before they're recycled.
> 2. If a job has been copied, Bacula should probably display an information
> message during the restore that indicates that the JobIds to be used have
> Copies.
>
Yep.
> 3. The restore command should allow the user to select any Copy job or jobs.
>
Definitely.
>
> I propose that we modify the Jobs to look like the following:
>
> +-------+--------------+---------------------+------+-------+----------+-----------+-----------+
> | JobId | Name | StartTime | Type | Level | JobFiles |
> +-------+--------------+---------------------+------+-------+----------+-----------+-----------+
> | 1 | CopyJobSave | 2008-12-15 20:38:28 | B | F | 7020 |
> | 5 | CopyJobSave | 2008-12-15 20:38:28 | C | F | 7020 |
> | 2 | CopyJobSave | 2008-12-15 20:38:32 | B | I | 999 |
> | 6 | CopyJobSave | 2008-12-15 20:38:32 | C | I | 999 |
> | 3 | copy-job | 2008-12-15 20:41:05 | c | F | 0 |
> | 4 | copy-job | 2008-12-15 20:41:50 | c | F | 0 |
> | 8 | RestoreFiles | 2008-12-15 20:42:39 | R | F | 7020 |
> +-------+--------------+---------------------+------+-------+----------+-----------+-----------+
>
> Now here, JobIds 5 and 6 no longer appear to Bacula like they are Backup
> jobs,
> rather they are marked as Type=C (i.e. a Copy job), and so they will never be
> considered for restoration by default. I've give the Copy control jobs the
> Type 'c' to distinguish them from the real copy -- they exist just to record
> the actual time the copy was made.
>
Looks good.
> Now by modifying the restore code in Bacula, we should be able to provide
> features that allow the user to know that there is a Copy of JobId 1 (i.e. 5)
> and a copy of JobId 2 (i.e. 6) and allow him/her to choose which copy to use.
>
> In my opinion, this would simplify future handling of Copy jobs allowing a
> lot
> more flexibility and avoiding confusion. However, it will cause some minor
> changes (nothing serious, I believe) for users already using the new code.
>
That's not a problem.. something we need to deal with.. being beta-testers:)
>
> Note, instead of selecting pairs (original Job, Copy), since all the jobids
> are unique, you could simply just type in the desired jobids. For the above
> example: 7,6,3,4.
>
> Any comments?
>
Thanks for working with this!
-- Pasi
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