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

PGP-Key: DDD3 4ABF 6413 38DE - https://www.pocnet.net/poc-key.asc



As an Amazon Associate we earn from qualifying purchases.

This thread ...

Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2022 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.