Hello everybody,
I need a little help from someone more experienced with Bacula than I
am.
My cluster consists of ~40 clients, the total amount of data that has to
be backed up is around 6 TB. To accomplish this I have two HP Ultrium
960 (400/800GB) and a sufficient number of tapes.
I am planning to have a 'full' backup of all my clients every two or
three weeks and 'incrementals' all other workdays.
My plan is, to have about three computers per night in the 'full'
backup, all others in the 'incremental'. The next night, the next three
in the 'full' and so on, so that after ~3 weeks all clients have been
fully backuped and we will start with the first ones again.
According to the manual, the best way to do so is to define two pools, a
'full' and an 'incremental' which also allows me to write to the two
tape drives simultaneously (one for each pool), which is mandatory since
backups have to be done quite quickly at my site.
In addition I have to run my backups on a 'daily tape rotation' basis.
So, if I understand correctly, I would need another 5 pools (mo-fri).
That makes 10 pools for mo/fr, full/inc.
Now I have two questions.
* Does this setup sound reasonable to you, or did I get something
completely wrong? I would be happy, if there was an easier way...
* How do I know, how many tapes I have to assign to each pool, because
the amount of data is by far not constant per day and client. I do not
want to have unused tapes, only because they were needed once.
Let me give you an example.
Let's assume, that usually one tape for the 'full' and one tape for the
'incremental' per night is sufficient. Then I would assign one tape to
each pool. During one Tuesday night the 'full'-pool runs out of tape,
because some user has produced a TB of data the last day. Then, I guess,
I would have to add another volume to the 'full-tuesday' pool and finish
the backup on Wednesday morning, right? But what happens, if all other
Tuesdays one tape is sufficient again ? Do I have to put a date sticker
on that once used 'extra' tape and check/erase that tape manually after
the first tuesday run where it was not needed so that I could use it for
another day's oversize backup?
You see, the very same setup was very easy in Amanda I used up to now.
The only thing I had to do was to create two identical setups and put
50% of my clients in the one (using tape1) and the other 50% in the
otherone using tape2, tell Amanda how many tapes I have and that's it.
All the full, incremental and daily rotation thing is handled fully
automatically.
I would be very happy if somebody could help me with these questions!
Thanks in advance,
Ralf
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