> Preston de Guise 
> 
> Any change you make to the staging policy will come into effect 
> immediately, so if you want for the time being you can push your max 
> storage period out to a larger value, and then tweak it back down 
> later when you've worked out what your optimum options are.

OK - That makes sense. I saw in the admin guide where it said that edits 
to the policy take place immediately, but I wasn't sure if that meant 
"right now, from this point forward" in terms of savesets or globally, 
'past and present'. So it's global and instantaneous.

 
> As to tips/traps, the key thing of course is managing capacity of each 
> individual disk backup unit; NetWorker doesn't move backups from one 
> DBU to another if the first fills, so if that happens you'll have an 
> immediate staging requirement, which is where watermarks will come in 
> - indeed, watermarks should come in before that, but it doesn't quite 
> always happen depending on availability of tape, levels of activities 
> on the volumes and sizes of the largest savesets.

Does the high watermark apply to AFT volumes individually, or to the pool 
they belong to as a whole? For example, if you have a pool with five 
volumes and an 80% threshold, would it stage upon the first volume 
reaching 80% capacity or when the aggregate total of all five (i.e., the 
pool) reaches 80%?

 
> Best thing is if 7 day retention is too short, push it out, and 
> monitor how things go closely with a view to pulling it back down to a 
> "middle" point if a month turns out to be too long.
> 
> (As much as anything, determining optimum time on disk boils down to a 
> variety of factors including frequency of full backups, maximum size 
> of any individual saveset, number of tape drives available for cloning/ 
> staging, whether you're cloning as well, etc.)

Fortunately, in this case it's a system that backs itself up full every 
night (i.e., reasonably simple environment for the moment). Of course, 
we're gonna add some other diff/full clients to the mix RSN... :-)

Thanks for the help.

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