We use AIT-3 tapes, which hold 100 GB natively and up to 260 GB 
compressed, in a Spectra Logic 20K library.  (I know we'll never see 260 
GB, but we do have a lot with up to 190 GB.)  However, I've noticed that 
for one of our volume pools the tapes are being marked as full with only 
about 85+/-5 GB.  The data being written to the tapes is already (and 
must be for disk storage purposes) compressed with gzip, so am I correct 
in assuming that the software compression (about 75%) is leading to the 
hardware compression actually inflating the data somewhat?  Is there 
anything I can do about this?   The files average around 41 MB 
compressed, 186 MB uncompressed.

-- 
Justin C. Lloyd
Unix System Administrator
MCI System Technology Solutions
Office 703.886.3219 Vnet 806.3219