> Are there any settings? Or indicators? I don't see anything in the 
> hardware interface (it's an HP LTO-4 G2 autoloader). Or am I just 
> confused? :-)

I take that back - on the web interface of the single drive in the 
autoloader, I do see
"
Data Compression 
Yes 



So I guess that answers whether the drive *can* do it. Guess I need to see 
that it actually *is* doing it. Is the only way to do a "mminfo" on a FULL 
tape volume, and add up the total of the saveset sizes, and compare to 
400G? (the nominal size of an LTO-3 tape? I was mistaken, BTW - it's 
LTO-3, not LTO-4)

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