Hello Paul,

Am 03.12.2019 um 21:59 schrieb Steinmetz, Paul via MIDRANGE-L <midrange-l@xxxxxxxxxxxxxxxxxx>:

VTL sizing - how much VTL DASD is needed for a full LTO7 cartridge (15.0tb compressed / 6.0 tb uncompressed).

You gave the answer yourself in the subject line. Maybe you're not sure about the compression ratio, real drives are writing, but this doesn't matter for "imaging" of tapes: That is what the drives handle internally. So achievable compression is heavily dependent on the data itself. Also, VTL files can be compressed on disk differently or not at all (for performance reasons).

So, if you "extract" a full cartridge, the resulting data size will be at least 6 TB (if not compressable) to about 9-10 TB with "real world" data. I rarely saw compression ratios in Excess of 1.5:1.

Hope this helps.

:wq! PoC

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