Hi Paul
The example, WAS an example :-) I wasn't reflecting anything of my setup -
purely examples :-)

Regards

Simon Weaver
3rd Line Technical Support
Windows Domain Administrator 

EADS Astrium Limited, B32AA IM (DCS)
Anchorage Road, Portsmouth, PO3 5PU

Email: Simon.Weaver AT Astrium-eads DOT net



-----Original Message-----
From: Paul Keating [mailto:pkeating AT bank-banque-canada DOT ca] 
Sent: 26 April 2006 14:49
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Volume Pools [recommendations please]


> -----Original Message-----
> From: WEAVER, Simon [mailto:simon.weaver AT astrium.eads DOT net]

> It may or may not be a problem, but if 1 1/2 tapes are used
> for a policy
> with a 2 week retention and then a 2nd policy comes along and uses the
> remainder of that 1/2 tape with a retention of 2 months, that 
> tape cannot be
> used until the image expires (at least that is how I see it).

Yes, however, Netbackup will not do that....one a tape is written with an
image with a 2 week retention, that tape will only be used for other images
with a 2 week retention, untill the tape is filled, and then after 2 weeks,
the entire tape will return to scratch.

There is an explicit option "mix retentions on media" that you can enable,
if you really have a justification, but I can't think of one.



> 
> We have Policies that include Full and Incrementals. They are
> multiplexed
> onto several tapes, but Incrementals are set to only 
> multiplex to one tape.

Hmmm....looking at my schedules, I'm trying to figure out how you limit the
number of tapes used on a per schedule basis, in a given policy.

> I would say your environment is a lot smaller compared to
> ours (not really
> sure of your setup), but again each Business is going to do things
> differently.

Yeah....for sure....you've got more than double the amount of data backed
up. I guess the way you broke it down in your example, ie. a server, three
tapes...implied something smaller. That could be an issue....but if you have
50 clients in a policy and you do have cases where 2 policies use a pool,
then you are taking advantage of economy of scale...if you've got 13
policies, then you've got what? About 10-12 pools? That doesn't sound so
bad.

Paul

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