Gordon,
I've though of doing this in the past, but, if we postulate a random daily
change rate, then the chances of a particular file being changed in any one
month are
at 1% , 1-(0.99**30), or about .25
at 2%, 1-(0.98**30) , or about .45
at 3%, 1-(0.97**30), or about .60 (Please feel free to correct my maths if
I'm wrong - probability was never my strong point)
Now, of course its often the same files which change day after day, so real
experience should be better than this, but at the time, I decided that the
overhead of mainitianing two TSMs (and two clients per node) wasn't worth the
benefit, and went with archives.
Can I ask what rate of change you are seeing on your monthly backups?
Thanks
Steve
Steve Harris
AIX and TSM Admin
Queensland Health, Brisbane Australia
>>> gordon.woodward AT DB DOT COM 16/07/2004 11:22:20 >>>
We use to do full Monthly archives of all our important data on our servers but
our TSM database was growing too rapidly, especially when we have to retain our
backups for 7 years. What we ended up doing is registering a whole new
alternate set of nodes specifically for Monthly backups and now just run
incrementals. Our database doesn't grow as rapidly anymore and we don't chew
through as many tapes.
I'm thinking of now creating a second TSM instance and have that running
exclusively for our monthly backups to take the load off our day to day
operations.
Gordon Woodward
Wintel Server Support
mbantz AT RSINC DOT COM
Sent by: To: ADSM-L AT VM.MARIST
DOT EDU
[email protected]. cc:
EDU Subject: Thoughts on Monthly
Archives
16/07/2004 07:00
AM
Please respond to
ADSM-L
We are implementing the following:
Monthly FULL backups, saved for 4 years for document retention purposes.
Backupsets are not viable, as a restore would be a pain. So it looks like
we're going to do this with archives. My idea is to create another storage
pool with it's own media, another domain with it's own management class (we
really need only one: save 1 version of this file for 4 years), and remove
that media once the archive runs.
Anyone care to comment on if this is the best, easiest, way to do this? Or
comment on what to expect with things like tape usage and database size?
We're currently at 57% of a 12gig database.
Thanks in advance!!!
Mike Bantz
Systems Administrator
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