Heinz-Josef Claes wrote:
following scenario: The data from the file and print servers is
synchronised in the night via rsyc to some cheap servers with fat disk
Amanda with client side compression (the default setup for many
people) can achieve the same effect (although not as efficient
as rsync, but not that far either). Amanda spreads out the backup
over the dumpcycle so that each night it has to do about the same
amount of work.
I know, it's a different approach than many (most?) other backup
schemes, but in reality this work very well.
The holdingdisk feature of amanda (your "fat disk") is an integral
part of the system, and makes it possible to start many (slow) backups
in parallel, and, at the same time, writing to the tapedrive in top speed.
(Of course your other reasons to use your planned setup with
storeBackup, fast/easy restores by users etc are still valid. And
indeed, rsync can mirror your filesystems even faster.)
decision up to know about this. -> So, amanda has a lot of time to do
the backup, there are only a few clients (with big storage) to the
servers (with the robots) and perhaps we can use less robots because we
will not do a daily backup.
Beware that Amanda works faster/better with many smaller clients than
with few big clients. There can be more done in parallel if you have
more clients.
About 6 years ago, I worked in an environment with 8 big servers
and each had a tape drive dedicated. The backup, with a home made
script, took about all night on some systems, just completed in time
before the first people started coming in.
Then I switched companies, and learned about Amanda. In my current
config I do my daily backups with 1 tape drive and I have about 25
servers (big and small) + 12 MSWin systems to backup. The total amount
to backup is 12 times more than before. And my backup time each night
takes only 3.5 hours.
I also have an "archive" run each weekend (only full backups) to
2 drives (+ one flush on a third tape on monday morning).
This takes only 8.5 hours. However, if I had to serialize all
those backups it would take 42 hours. Amanda makes it possible to
squeeze those 42 hours in less than 9 hours.
If someone told me that 6 years ago, I wouldn't believe him.
--
Paul Bijnens, Xplanation Tel +32 16 397.511
Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM Fax +32 16 397.512
http://www.xplanation.com/ email: Paul.Bijnens AT xplanation DOT com
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