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The various VTL manufacturers will have some say in this.
First of all make sure they support BRMS. Some use their own save/restore commands. Some find them economical but they do not play with BRMS or regular save/restore and you need physical media for the 'bare metal' part. I would not use these but I know people who do.
Each VTL manufacturer has their own sizing formulas. With just enough complication in there to seriously cover their tails if you underestimate. Most dedup. Basically if you have the same library saved 10 times and it took 50GB on mylar it will not take 10x50gb on the vtl. Much, much less.
Initializing 100 1.5TB LTO5 tapes does not immediately take up 150TB of disk on the VTL. The real size is based on how much data is saved on each tape factored greatly by the deduplication.
We had our consultant from Sirius help us set this up originally.
Once you leave mylar you will never go back.
Rob Berendt
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