Is there any way to tell how much of a tape I am really using?

For example I have both AIT1 and AIT2 drives and I using 170M and 230M
tapes respectively.  I write to the compressed device in both cases. I
set the lengths conservatively to 32000 mbytes for the AIT1 drives and
66000 mbytes for the AIT2 drives.  I would like to check periodically
and see how much of the tape I am actually using.  Full backups are
already over 100 GB and disk usage is only going up so a reasonably
good estimate of actual usage tells me how much I can increase the
length values before allocating another tape to the backups.

-- 
-- Stephen Carville
UNIX and Network Administrator
Ace Flood USA
310-342-3602
[EMAIL PROTECTED]

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