.................. The only normal reason to turn on software compression
would be if you don't have a very good network between the client and your
media server, and you need to save the bandwidth - say you're backing up a
remote site.  Otherwise turning on compression is only likely to make your 
backups slower and to make them use more tape...............

[gty]Or, if you were using client encryption.  Compressing the data after
it's encrypted isn't going to give a very good result.  Compressing on the
client before encrypting would be the only way to save space.

Thanks,
Gregg Yurchak
VERITAS Professional Services
Biloxi, MS
Cell:   228.324.6939
Office: 228.575.6299


-----Original Message-----
From: Steve Hanson [mailto:steven.hanson AT uwrf DOT edu] 
Sent: Thursday, March 28, 2002 4:24 PM
To: Gardner, Jesse
Cc: 'veritas-bu AT mailman.eng.auburn DOT edu'
Subject: Re: [Veritas-bu] Multiple processors, compression in NetBackup

The compression is on the client.

My question here is --- why are you turning on compression?  Most tape 
drives these days do hardware compression - certainly your drives do on 
this library.

The only normal reason to turn on software compression would be if you 
don't have a very good network between the client and your media server, 
and you need to save the bandwidth - say you're backing up a remote 
site.  Otherwise turning on compression is only likely to make your 
backups slower and to make them use more tape.


Gardner, Jesse wrote:
> In preliminary testing of our new NetBackup configuration, we ran a 
> class with and without compression.  Using compression doubled the time 
> it took the class to finish.
> 
> The class consists of one client, specifying about 34GB of software 
> installation files and hardware drivers to be backed up.  The client is 
> connected to the media server via TCP/IP ethernet.  The media server is 
> a dual Xeon 333 with 500mb RAM running Windows 2000, connected via 
> fabric SAN switch to an HP Surestore-E library.
> 
> Now for the question:  Would adding more processors to the media server 
> speed up the compression considerably?  (or, possibly, is the 
> compression done at the client?)
> 
> If we should add more processors to the media server, are they 
> automatically detected and used by Netbackup 3.4.1, or is there extra 
> configuration there?
> 
> Thanks!
> Jesse
> 


-- 
Steve Hanson
UW River Falls ITS
715-425-4357

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