[ILUG] dump and compression

From: Conor Daly (conor.daly at domain oceanfree.net)
Date: Mon 15 Jul 2002 - 11:00:42 IST


Puzzled here...

I'm using dump to backup to CDRW. If I do

dump -0 -B 665600 -f dump.dat /

I get a file dump.dat 650Mb in size. That gets burned to CDRW before dump
continues and uses the same file for the next bit. I can backup a 2Gb
partition in about 4 CDRWs. If I use dumps compression option thus:

dump -0 -B 665600 -f dump.dat -z9 /

I get a file dump.dat about 215Mb in size and dump happily announces that
it hasachieved 3:1 compression. But, I wanted dump to stuff as much
compressed data as possible into a _650Mb_ file! Id there something I'm
missing? I suppose I could use the tape length options to specify the
media size instead but it just don't feel right.

Conor

-- 
Conor Daly <conor.daly at domain oceanfree.net>
Domestic Sysadmin :-)
---------------------
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