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From: info-vax@ucbvax.ARPA
Newsgroups: fa.info-vax
Subject: compressing disk space
Message-ID: <8720@ucbvax.ARPA>
Date: Wed, 3-Jul-85 02:08:26 EDT
Article-I.D.: ucbvax.8720
Posted: Wed Jul  3 02:08:26 1985
Date-Received: Thu, 4-Jul-85 00:16:47 EDT
Sender: daemon@ucbvax.ARPA
Organization: University of California at Berkeley
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From: Ronald A. Jarrell  


VMS has always had problems with fragmented disk packs.  Most systems
do, if only because it destroys your performance slowly but surely.  The
only real way to compress a pack under VMS is to do a BACKUP/IMAGE to
your favorite media (another pack or to tape)  and then reload it.  If you
have removable packs, you can just BACKUP/IMAGE to the other pack and
start using it instead.  A BACKUP/IMAGE restore reloads each file in it's
entirety, because when it dumped them it dumped each completely, so your file
system starts out contiguous.. We schedule fairly regular periods of
compressing at least our system pack.


-Ron