OK boys, (and girls, altho we seem to be generally keeping our mouths
shut on this one!) to summarize... 

1. Yes, you can have multiple retentions on a single piece of media. We
have established this at least 40000 times on this list. However, it is
not recommended to do. (unless your life sucks like Jonathan's here)

2. Volume pool configuration is really up to the individual shop.
PERSONALLY, I do not use the NetBackup pool for anything but catalogue
tapes. If you opt for the 1 POOL configuration, your best bet would be
to make an alternate pool, set your policies up to use it and then throw
everything into it.

3. If you opt for Multiple Volume Pools, best practice is to utilize a
SCRATCH POOL and let NetBackup divvy the tapes up accordingly. Post-4.5,
if a tape starts in SCRATCH, it will be returned to SCRATCH once it's
de-assigned.

I, personally, use Volume pools based on the Environment which they back
up (Corporate, Web, etc.). I also use volume pools for duplicated tapes.
I support a 250 + TB environment and this works well for me.

Breaking things out and micro-managing this application is really not
necessary. As long as it's set up intelligently, it will self-manage,
unless something in your environment breaks.

~Kate



-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Martin,
Jonathan (Contractor)
Sent: Wednesday, April 26, 2006 12:56 PM
To: Paul Keating; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Volume Pools [recommendations please]


Sorry to call you on this one, but you CAN have multiple retentions on
one tape.  Under your Master Server Properties / MEDIA there is a "Allow
Multiple Retentions Per Media" check box which I am forced to use.  I've
got 4 sites without robots that use Netbackup to write 2 week, 3 month
and 1 year retention data to and without this I'd be up the creek!

I'm not sure who shelled out the big bucks for Netbackup for a site with
no robot, but that's another debate entirely! =P

-Jonathan

-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Paul
Keating
Sent: Wednesday, April 26, 2006 12:40 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Volume Pools [recommendations please]

> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Dave
> Markham

> 
> Correct. Unless you have mix retentions on media set which i think
> everyone has agreed is a bad idea.

Agreed...but mixed retentions has nothing to do with multiple volume
pools. You can have 10 different retentions and only 1 volume pool, and
you will not get two different retentions written to the same media. A
single volume pool does not equal mixed retention on one media.

> 
> Your description below uses 4 tapes ( if one tape per backup is used )

> which are all associated to the same volume pool.

But each tape has a different retention.

Paul

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