Hi. I'm redesigning my Bacula setup as I deploy some new file servers.
I've done some experimenting, and I just want to clear up my understanding
on a few points.
I'm running 5.2.12 with the director on Ubuntu 12.04 LTS. The FDs and SDs
are on QNAP NAS boxes with a 5.2.12 package that I have built and
installed. I use the 'LD_LIBRARY_PATH=' to let the Bacula daemons find
their libraries in /opt/lib.
In my test setup I have a full pool and an incremental pool defined, and
the fileset specifies "accurate = sm". The incremental pool specifies
Maximum Volume Jobs = 1
Maximum Volumes = 3
Purge Oldest Volume = yes
In my test I did first ran a full then did the following:
Modify file1
Run Incremental
Modify file2
Run Incremental
Modify file3
Run Incremental
At this point I have three volumes in my incremental pool. The first
contains only file1, the second only file2 and the third only file3.
Modify file4
Run Incremental
At this point I still have only three volumes in my incremental pool, since
I've told it to limit the number of volumes and purge the oldest. At this
point one incremental contains file2, one contains file3, and the latest
contains file1 and file4, because when the fourth incremental job started
up and purged the first-used incremental volume, the modified version of
file1 was no longer on any backup. The accurate code picked this up and
put file1 on the fourth incremental.
Modify file5
Run Incremental
Now one incremental contains file3, one contains file1 and file4 and one
contains file2 and file5.
Now this actually seems to work pretty well. All the files are backed up
and each in only one place. So the first question is: Does this seem like
a reasonable approach? The second question is: What is the relationship
between the Full backup frequency and the optimum number of volumes in the
incremental pool, assuming a daily incremental?
Thanks all.
--
* Jeff Dickens*
IT Manager 978-632-1513
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