bpmedialist will give you a count of how how many bytes are on the tape
(kbytes column):

> bpmedialist -U
Server Host = XXXXXXXXXXXXX

 id     rl  images   allocated        last updated      density  kbytes
restores
           vimages   expiration       last read         <------- STATUS
------->
----------------------------------------------------------------------------
----
004526   3    310   08/21/2005 03:40  12/11/2005 06:36  hcart2    61698920
0
              MPX   01/11/2006 06:36        N/A

004696   3    874   11/20/2005 02:37  12/12/2005 02:33  hcart2   318870566
0
              MPX   01/12/2006 02:33        N/A

004801   4     32   11/15/2005 19:54  11/15/2005 19:55  hcart2    81122987
0
              MPX   01/16/2006 19:55        N/A

005165   6      6   06/15/2005 19:33  06/15/2005 19:33  hcart2    19992648
2
              MPX   06/15/2006 19:33  07/11/2005 15:52

005265   3   1874   06/10/2005 16:54  12/11/2005 06:01  hcart2   557969356
0
              MPX   01/11/2006 07:29        N/A

After that, you're starting to guess.  Because the amount of bytes per tape
can vary by the compressibilty of the data, the total amount of bytes
actually stored on the tape can vary.  The closest you can do is calculate
some sort of average compression ratio by looking at full tapes, then
estimate based on that for your non-full tapes. Personally, I'd do this by
volume pool as my compressibility is going to vary a lot by data source.


HTH - M


-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Piszcz, 
Justin
Sent: Thursday, December 15, 2005 10:40 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Question regarding available tapes.


Hello,
 
I can easily see how many scratch tapes, those that have not been written to
yet.  However, I probably have several tapes that are currently not fully
filled up, scratch tapes that had a few fragments written to it.  Is there
anyway to determine how full the tapes are?
 
Justin.