Your tape management system (CA-1, RMM etc.) can tell you what it thinks is the
size, and your Virtual tape appliance has the data on how much it compressed it
(if at all) after it got hold of the data. Also, if you data is sent to a
storage point, i.e. like storing on a NetApp appliance instead of internally to
the virtual tape appliance, then it could have yet a different number depending
on it's compression and deduplication settings.
So, I guess the answer is that you have the data available at multiple points,
and they are all correct for that particular spot.
CA1 could think it wrote 5GB to the tape, but the virtual tape appliance might
have compressed it down to 2gb (IDRC and it's own internal compression) and the
Network appliance could have manged to make it 1.5GB (or 3GB if it was poorly
set up). They would all be "right".
Brian
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