Curtis,

>> Data Domain has good market share, but very few DD customers use VTL.

Really? That surprises me a little (i.e., the marginalised VTL usage) and isn't 
necessarily representative of the TSM customers I've spoken to or worked with 
using DDRs, many of whom still use the VTL functionality. I can't comment on 
whether this is so much the case with shops that use other backup software 
though (e.g., I know NBU has its own OST interface).

In any case, whether through VTL or NFS/CIFS the principle is the same and of 
course you're right, pre-appliance compression or even encryption can be 
catastrophic to data de-dupe ratios. Without knowing any more, it sounds like 
you may have to make a compromise somewhere without changing your current 
config Nancy, either in terms of backup data storage footprint or RPO.

Cheers,
__________________
David McClelland
London, UK

On 26 Aug 2010, at 19:10, Nobody <wcplists1 AT GMAIL DOT COM> wrote:

> Data Domain has good market share, but very few DD customers use
> VTL.