Hello,
09.11.2007 08:06,, S. Kremer wrote::
> Hi Arno
>
>>> i have to backup a nas system with a total size of 6,5TB. At
>>> this time the nas system only has ~2TB of data that have to
>>> backup but in future, the next two years data will be increase
>>> up to 6TB.
>>>
>>> I have installed Debian Etch on the nas system with samba und
>>> bacula as backup application. I use a Sony StorStation LIB-81
>>> autochanger with 7 200GB/520GB AIT4 tapes. In slot 8 there is a
>>> cleaning tape.
>> 7 slots à 200 GB is 1.4 TB. Adding compression (factor 2.6 is,
>> typically, much too optimistic) you might end up at a bit above 2
>> GB.
>
> I agree with you too that compression of factor 2 and more is
> fairly optimistic.
In your case - mostly mpeg files - compression will not yield much at all.
>> That's obviously not enough space to handle a full backup of 6
>> TB.
>
> Ok. I know that i could not backup all data without manual
> intervention. In fact i have more than only 7 tapes to backup data.
> Lots of data that i have to backup should only archive one or two
> years. these files (mostly mpeg videos) are static and there are no
> changes. Therefore, it is enough to backup these data once for
> archiving and place the tapes in safe or any other secure place.
Ok.
>>> What is the best backup strategy for this scenario and how to
>>> handle the tapes with bacula and the autochanger.
>> You can run full backups only with intervention in between, which
>> pretty much rules out unattended backups during the weekend.
>
> What I imagine is... no intervention between monday and thursday
> because the backup here should only save the changes of the files
> (incremental).
No problem, I assume.
> At friday afternoon a manual intervention is
> neccessary to do a full backup at weekend. But i have problems or
> difficulties to configure the tapes in bacula. I read something
> about the pools but i do not really understand how i should
> configure the pools for my scenery.
>
> In the user manual this is an example:
>
> Pool { Name = Full-Pool Pool Type = Backup Recycle = yes AutoPrune
> = yes Volume Retention = 6 months Maximum Volume Jobs = 1 Label
> Format = Full- Maximum Volumes = 9 }
>
> Pool { Name = Inc-Pool Pool Type = Backup Recycle = yes AutoPrune =
> yes Volume Retention = 20 days Maximum Volume Jobs = 6 Label Format
> = Inc- Maximum Volumes = 7 }
>
> But i use barcodes, so the label of the tapes is allways different
> and start without a "Inc-" or "Full-" phrase. In the users manual
> of bacula i do not find something to handle tapes with barcodes in
> pools. e.g. i would like use one pool of tapes for the daily
> backup, one pool for the weekly full backup of all important files,
> one pool for the monthly full backup of all files and one pool with
> the tapes that contains the archiving files.
You simply use the barcode labels, and put the volumes into the right
pools. You don't use the LabelFormat in this case. Also, automatic
labeling is probably not necessary for you.
The volume names are not related to the pool assignment. With an
autochanger with barcode capability, you really want to use the
barcode labels, otherwise the barcodes can't be used.
>
>>> I would like backup each day mo-do
>>> incrementally/differentially.
>> That shouldn't be a problem with your setup.
>>
>> You should set up the necessary jobs and schedules yourself - or
>> get commercial support if you don't want to. Examples are freely
>> available here, advice too, but you should offer us a starting
>> point, i.e. a configuration and any problems you encounter.
>
> This is another problem. I do not really understand how jobs,
> jobdefs, pools, schedule works together. With jobdefs i can define
> a template that i can use in other jobs by reveral is that right?
Yes.
Define the pools you need.
Set up the jobs you need, preferably starting with one job only. Once
you've got that working, creating similar jobs is rather simple.
Preferably, use the "Full Backup Pool", "Differential Backup Pool",
and "Incremental Backup Pool" directives.
Schedule the jobs with the job overrides for the level to run.
Load blank tapes, and issue "label barcodes slots=1-4 pool=Inc-Pool"
and similar.
Now you've got volumes for the pools you want to use. For the first
run, you'll need volumes for the full backup pool, of course.
As long as you keep the needed volumes in the autochanger - Inc-Pool
during the week, Full-Pool on the weekends - jobs should run
automatically according to your schedule.
You'll probably have to intervene during the weekend, once your data
grows...
I'd recommend to run full backups once in a while, though - probably
you can get along with the full backups for the archive pool only, but
if you want to store them off-site, you might find it more convenient
to have a recent full backup available, too.
Arno
>
>>> Each friday but the last friday of month i would like do a full
>>> backup and even so the last friday of month.
>> This will get difficult.
>>
>>> Is this a good concept for backup the data or has anyone here a
>>> better suggestions.
>> Basically, it's usable. Whatever strategy you implement should
>> simply fit to your needs.
>>
>> If you want monthly full backups for archival, that can be done.
>>
>> Storing the full 6 TB during one weekend will more or less be
>> impossible with your current equipment.
>
> At this time there are no 6TB of data at the nas system. The full
> capacity of the nas system is 6,5TB. Data will be increase year to
> year lots of data only have to backup once for archiving. than the
> tapes can place in a safe or something else. So this archiving can
> be carried out at one weekend.
>
> Stefan
>
--
Arno Lehmann
IT-Service Lehmann
www.its-lehmann.de
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