Hello, In our company we have a TSM 6.2 Server with a TS3310+Extension (LTO-4) Library for primary pools and an Overland Library for copy pools (LTO-2). Now the Overland is nearing retirement and we need a replacement. We have 46 Nodes with a total of ~16TB in need of a copy pool (with more nodes in tsm, but they are not that important). Of that 16TB, 3-4 TB are MSSQL and Oracle Databases, the rest is Windows and Linux Operating Systems. The way I see it, there are two options. 1: We get another TS3310 base model with LTO-5 drives (or any other Tape Library). We would get about 38TB in 24 Tapes, and we probably have to turn off collococation. If necessary we could get an Expansion for the Library. 2: We get a Virtual Tape Library, say a TS7620 with 24TB Diskspace (12x2TB Disks), which would cost as much as the TS3310 (more or less). I could make a lot of small volumes (say 50-100GB) which would probably increase restore speed in comparison to a real Tape Library. On the other side, the VTL has less raw space. But with data-deduplication we probably could get much more out of it. And that's my problem: I did some numbers after reading some guides on the web, and results vary from data-reduction of 10-50%, but we really have absolutely no experience with data-deduplication. Can anybody please give me some advice on what would be the best option? What are your experiances with VTL and data-deduplication? Would even a smaller VTL be sufficient? Any help would be really appreciated.
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