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I have a question about my DDS4 drive...

I have been backing up a 20GB FS with a DDS4 drive for quite some time.
The filesystem has been getting increasingly full, and until recently
was only 75% or so. I've reached 95% and my backup now exceeds one tape.
The estimated backup size is 19.766GB.

However, my DDS4 drive is reporting tapes full at roughly 17.8GB.
Hardware compression is presumably enabled (I'm writing to /dev/rmt/1cbn
on a Solaris box). I'd like to check somehow, but am not sure how to do so.

I know a lot of the data is uncompressable, but wouldn't that make the
data larger (ie. the data will hit the capacity of the drive and request
a new tape), not make less fit on a tape?

Any hints for what to try here? I am formatting the tape now to make
sure that the capacity is correct (though this idea may be a holdover
from when I was using DLT's, which seemed to be forward and backward
compatible).

If I am formatting /dev/rmt/1 instead of 1cbn, does that somehow turn
off compression?

Thanks for any help!

- --
 ---- _  _ _  _ ___  _  _  _
 |Y#| |  | |\/| |  \ |\ |  | |Ryan Novosielski - Systems Programmer III
 |$&| |__| |  | |__/ | \| _| |[EMAIL PROTECTED] - 973/972.0922 (2-0922)
 \__/ Univ. of Med. and Dent.|IST/AST - NJMS Medical Science Bldg - C630
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