Hello,
On 3/3/2006 12:02 AM, Thomas J. Lohman wrote:
The most important thing is probably what amount of data you expect from
each machine, and how much of it changes. Assuming a short backup time
window and expecting lots of changed files from many clients might force
you to implement more complicated schedules than you'd might wish (for
example four groups of hosts to have the full backups on four separate
weekends).
Thanks Arlo. Yes, I probably should have mentioned a general amount of
data. We probably have between 4-5 TBs of data across the machines. Some
of this may not be backed up and can be filtered out.
Ok, so assuming 4 TB per full backup for all clients, with a typical
data throughput to the tape of 140GB/Hr (LTO-2 estimate, YMMV) you'd
need more than a whole day, but, even assuming an overall throughput
below 100GB/Hr, it should be possible to run the full backups on two
weekends, for example.
With any recent tape library or disk subsystem with the necessary
capacity you should be ok, I think.
At the moment, the only other product we have looked at is Retrospect.
While it has worked ok, it has not been reliable and has tended to crash
when trying to back up some clients.
There was some discussion about a setup where Bacula would reproducibly
abort backups which, as far as I know, wasn't resolved, but usually I
see crashes from Bacula only when I play around testing new versions or
features that are in the process of being implemented, or when the
underlying hardware fails. With reliable hardware and a well-tested
setup I very seldom observed serious trouble.
We'd essentially like to mimic
the same type of setup that Retrospect allows with tape sets where when
the set gets big enough, you "archive" it and then declare a new tape set.
I have just begun to look at the technical details of Bacula so I can't
say if it works in a similar manner.
You will probably find that Bacula works quite different, and perhaps
you'll need some time getting used to how Bacula manages volumes, but
I'm sure that you can create a setup which does what you need. Might
need some scripting, and personally, I like to do things with the
catalog directly, but that's something you will probably develop once
you've got your basic setup running.
Arno
--
IT-Service Lehmann [EMAIL PROTECTED]
Arno Lehmann http://www.its-lehmann.de
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