On Wed, 8 Nov 2000, Chris Karakas wrote:
> When I first used AMANDA, I used it without compression. Then I upgraded
> the tape drivers (which used an inherend "block" compression,
> transparent to the user), the new ones did not support any inherent
> compression, so I had to use the usual "client" compression. I was
> amazed to see how much longer it took. Where AMANDA used to take 2-3
> hours to finish, now it took 6-8!
Thats all fine and good but my AMANDA server backs up 13 servers. 3 run
Solaris, 8 run Linux and 1 runs OS X Server. I can do full backups of all
the servers in less than three hours, with client-side compression, with
the exception of the OS X Server. It takes over 8 hours to compress and
backup 400 Mb of data on that machine (a 400MHz G4 machine with a Gig of
RAM). So its not merely an issue of gzip compression adding time to the
backups. gzip is just really, really slow when used with AMANDA under Mac
OS X Server. Command line issued tar/gzip pipes seem to work reasonably
fast on the OS X Server.
Its not a big deal - I've moved all compression to the backup server at
this point, but it is an oddity I was hoping to figure out.
Kevin
--
Kevin M. Myer
Systems Administrator
Lancaster-Lebanon Intermediate Unit 13
(717)-560-6140
