Very Computer

1. DAT tape - how much space is available?

I recently installed a Sony SDK-5000 DDS-2 DAT drive.  Since I'm
primarily backing up a very compressible database, I'm using 90M tapes
for a nominal 2.0GB before hardware compression (which, if it's as good
as gzip, should get about 4:1 on our data).

My question is this:  After doing a backup, how can I tell how much
space is used or available on the tape AFTER hardware compression, or in
other words to find out how much compression was achieved?

I know I sent a little over 2.3 GB over the SCSI bus to the tape drive,
but if it's getting even 2:1 compression, I should have room for a
number of differential backups AFTER the setmark on the tape.   If it's
not getting very much compression, the tape is almost full.

If it matters, I'm using SCO Open Network Server (SCO Unix 3.2v4.2), and
a BusLogic BT747 EISA to SCSI adapter.

Thanks much!
Mark Rafn

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