ADSM-L

Re: [ADSM-L] Seeking wisdom on dedupe..filepool file size client compression and reclaims

2009-08-31 20:07:10
Subject: Re: [ADSM-L] Seeking wisdom on dedupe..filepool file size client compression and reclaims
From: Mark Scott <MScott AT BUNNINGS.COM DOT AU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Tue, 1 Sep 2009 08:04:55 +0800
Good Morning
                We have been in the planning stages of moving our
production backup server to our non prod site and setting up cross site
vaulting.

The more I think about it, the more it makes sense to build a new server
and point the clients to the server running TSM6.*.

Our prod server is currently running 5.5.1 and the clients are also
updated to this level across AIX, Linux, Windows and TDP for RMAN.

Can someone point me to the documentation for supported clients etc as
in the short term I was hoping to build the server as rev6 and leave the
clients for the short term?

Any gotchas running TSM6* on AIX would be appreciated. 

Look forward to your response

Warm Regards 


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Allen S. Rout
Sent: Monday, 31 August 2009 9:53 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Seeking wisdom on dedupe..filepool file size
client compression and reclaims

>> On Sun, 30 Aug 2009 08:34:47 +0200, Stefan Folkerts
<stefan.folkerts AT ITAA DOT NL> said:


> Interesting ideas and a simulator would be fun for this purpose.
> You could be right and your example does make sense in a way but
> still..  I do wonder if it works out in the real world.

> Let's say you have normal data that expires (user files etc) and
> large databases, some you keep for many months and sometimes even
> years.

I understand the case you're making, and I agree that the size of your
files has an impact.  I'm suggesting that the impact isn't huge, and
that it evens out in a reasonably short timeframe.

Eventually, whatever the volume size, you wind up with a library full
of volumes more or less randomly distributed between 0% and 50%
reclaimable.  If you're keeping up with reclamation, that means you're
_in_ a steady state, so you're _doing_ the same amount of work per
unit time.


So when I say "To a first approximation, it's irrelevant", focus on
the "First appoximation" bit; Yes, there are variations here, but
don't sweat them too much.

It's certainly possible to back yourself into corners with very large
or very small volumes.



- Allen S. Rout

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