Per my Data Domain rep - when a DSU image expires, NBU deletes it.  Data 
Domain's product then checks all the blocks associated with that image file and 
removes any that are not shared by any other backups.

-Jonathan 

-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu 
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Paul 
Keating
Sent: Monday, September 24, 2007 12:44 PM
To: VERITAS-BU AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Script to label expired tapes in a VTL

It's not as complicated as you make it sound.

Like tape, you need to keep some overhead in free disk.

If you want to maximize the contiguous free disk available, then you would 
bplable tapes as they expire and go back to scratch.
As you write to a scratch tape, the space that cart previously occupied is 
released, so as you occupy more space with that tape, the data previously on 
that tape is again available for use...the background defragger will reclaim 
that space for a subsequent backup.

I'd like to know how this problem goes away with a de-duping "disk as disk" 
target.

If you write an image to a "disk-as-disk" target, and later the netbackup image 
expires, how are you "ahead" of the same position you'd be in with a VTL when a 
tape expires?

Paul


-- 


> -----Original Message-----
> From: Clem Kruger [mailto:clem AT re-thinking-it DOT com]
> Sent: September 24, 2007 12:20 PM
> To: Kevin Whittaker; Paul Keating; Curtis Preston; 
> VERITAS-BU AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] Script to label expired tapes in a VTL
> 
> 
> Hi All,
> 
> This is exactly right. The space is not available!
> 
> Let us assume that you need to write an urgent backup to a different 
> set of tapes. Although there are tapes that have expired, you may not 
> have space on the DISK to write to those tapes, your backup will fail. 
> Now go back to the directors and tell them you now need more space 
> because it has become so easy to create new tape drives as well as new 
> tapes.
> 
> The administration becomes extremely difficult if you are not using 
> Vaulting. Especially in large environments where you backup 10's of TB 
> every night.
> 
> It is not that I have anything against VTL's, it is my contention that 
> if you want disk to disk, rather do that. It is easier to manage. Why 
> be bothered still managing "TAPE"
> albeit virtual?
> 
> Kind Regards,
> Clem Kruger
====================================================================================

La version française suit le texte anglais.

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