I think I'll leave the question of upgrading to others, but from what I
heard here in the past, the general recommendation seems to be that you
really should be upgrading. It's just that I'm not all that familiar
with the version history, and don't know how important an upgrade from
2.0.3 would be.
In the current version of bacula (I do not know about 2.0.3), you can
control concurrency in various, and fairly complex, ways. There is a
section on it in the documentation, actually. Basically, there indeed is
a problem when you have multiple concurrent backups to a file, although
it is supposed to work for a tape. One drawback, even when it does work,
is that the data is going to be interleaved in the backup, and restores
will be much slower.
I believe you can get around the problems by using spooling.
In any case, I'm still trying to figure out the best concurrency scheme.
François Mehault wrote:
> Thanks a lot for your response; I will try to play with retention times. Yes,
> we are backing up to hard disk files. For you it is not essential to upgrade
> Bacula (we are currently in v 2.0.3)?
>
> I have also to fix problem about jobs which are launched simultaneously. Jobs
> are writing on the same volume at the same time :s, I am reading
> documentation to understand very what happens. The behaviour of Bacula is the
> same about concurrent jobs in v2.0.3 and v2.4.4?
>
>
> -----Message d'origine-----
> De : Kevin Keane [mailto:subscription AT kkeane DOT com]
> Envoyé : mercredi 11 février 2009 11:38
> Cc : bacula-users
> Objet : Re: [Bacula-users] What is the best to do ? I need some space.
>
> First of all, depending on your situation, I find that a full backup
> once a month, and weekly differentials, as you suggested, can be a
> pretty good schedule.
>
> When you run out of backup space, ultimately the problem isn't the
> schedule but interaction between schedule and retention times. If you
> have, say, six month retention times for full backups, your proposed
> change in the schedule will accomplish not all that much. You also don't
> mention whether you are backing up to hard disk files or to tape - but
> since you mention "space" rather than "number of tapes" I'm assuming
> hard disk.
>
> So what you would want to accomplish in the end is really to make sure
> you keep only two full backups of each client (you could even try for
> only a single backup, but at that point your data may not be quite safe
> any more, so I'd say, two is the minimum).
>
> Keep in mind that you will always need space for a third backup - the
> one that is in progress or that has just completed.
>
> You can accomplish that in two ways:
>
> - stretch the schedule.
> - reduce retention times.
>
> So for the full backups, you should pick a retention time that is a
> little longer than twice the distance between backups (it has to be a
> bit longer because the you want the backup to stay around until *AFTER*
> the next one has finished). If you do go for monthly backups, make the
> retention time 65 days. I would use the same retention time for the
> differentials, and maybe 15 days for the incrementals.
>
> After changing the retention times, you will need to restart the
> director and then update your pools and all the volumes that already
> exist in the pool. Otherwise, changes to retention times will only
> affect future backups.
>
> Depending on your setup, you may also be able to add additional hard
> disks. Do one set of backups on the first disk, then the next set onto
> the second disk. That will keep your data much safer because you no
> longer rely on just one disk to store your precious data, and it will
> even allow you to take one disk off site - and at the same time, you
> double your disk space.
>
> François Mehault wrote:
>
>> Hi All
>>
>> I would like to know what the best to do is. Today, in my company, backups
>> are scheduled like this: Full every Sunday and Incremental backups other
>> days. But resources becomes fully, I need to configure Bacula to take less
>> space. But also I need to preserve data safe. So I would like to schedule
>> backups like this: full backup on first Sunday of the month, differential
>> every other Sunday and incremental backups other days. Is it a good idea to
>> fix my problem? Have you some advice for me about my problem? My Bacula is
>> in version 2.0.3 (director, SD). I ask myself if I have to upgrade also.
>>
>> Thanks
>>
>> Regards
>>
>> François
>>
--
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