From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Kinder, Kevin P
I haven't used the following two features in combination yet, so a
question:

If I were backing up using subfile and collocation, would this alleviate
the problem of the subfile backups being spread over many volumes?

Marginally. You'd still have to wander an individual tape (or tapes) to pick up 
all the deltas that the subfile process created. This will greatly delay 
restores, particularly large restores of many small files. Also, remember the 
file size restrictions enforced by subfile work.

As I mentioned earlier, adaptive subfile backup technology was originally 
designed to accommodate small-ish backups coming through narrow WAN pipes. In 
the meantime, collocation will increase tape volume usage, overall tape 
traffic, and daily migration and reclamation processes.

As is always true in life, you end up having to rob Peter to pay Paul.

--
Mark Stapleton
System engineer, CDW

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