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 :: Mailing Lists

[ILUG] dump and compression

[ILUG] dump and compression

Conor Daly conor.daly at oceanfree.net
Mon Jul 15 11:00:42 IST 2002


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 oceanfree.net>

Domestic Sysadmin :-)
---------------------
Faenor.cod.ie
 10:55am  up 52 days, 20:12,  0 users,  load average: 0.17, 0.05, 0.01
Hobbiton.cod.ie
 10:44am  up 26 days, 10:06,  2 users,  load average: 0.08, 0.06, 0.01




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