You can select compression within the backup policy.  Just remember, this
will take additional CPU cycles on the client side and may not raise your
compression level any further than what the drive can do.  Your best bet
would be to send the data to the tape drive as fast as possible and allow
the drive to compress it.  To determine if software compression will help,
create a directory with a set amount of data in it, back it up without
software compression, then try again with it.

Tuning is a crap-shoot in some cases....

Matthew Moody
MCSI

-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Sen
Sent: Monday, May 05, 2003 10:21 AM
To: Paul Winkeler
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] number of tapes


how do i configure NBU to compress the data that it is going to backup?

----- Original Message -----
From: "Paul Winkeler" <pwinkeler AT pbnj-solutions DOT com>
To: "'Sen'" <discussion.groups AT gmx DOT net>
Cc: <veritas-bu AT mailman.eng.auburn DOT edu>
Sent: Monday, May 05, 2003 7:21 PM
Subject: RE: [Veritas-bu] number of tapes


Sen

You cannot set the ratio (wish that you could though!)  You can control
compression on a yes/no basis by configuring your OS appropriately but after
that compression is as good as the source data will let it be.

Why would you not compress?

 PaulW

www.pbnj-solutions.com IT Solutions That Stick
(216) 533-5708


> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Sen
> Sent: Monday, May 05, 2003 6:50 AM
> To: Matt Moody
> Cc: netbackup-l; nbu-lserv; veritas-bu AT mailman.eng.auburn DOT edu
> Subject: Re: [Veritas-bu] number of tapes
>
>
> how do i set the Compression ratio ??
>
> ----- Original Message -----
> From: "Matt Moody" <mattm AT m-c-s DOT com>
> To: "Sen" <discussion.groups AT gmx DOT net>
> Sent: Sunday, May 04, 2003 3:35 PM
> Subject: RE: [Veritas-bu] number of tapes
>
>
> > DLT8k drive assuming non-compressed will require 4 tapes for the
> > backup. Compressed 2:1 will require 2 tapes.
> >
> > ASCII data (text) is highly compressable whereas .pdf's and
> some image
> types
> > are not very compressable.  Assume 3 tapes, expect less required.
> >
> > Matthew Moody
> > MCSI
> >
> > -----Original Message-----
> > From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> > [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Sen
> > Sent: Sunday, May 04, 2003 1:07 AM
> > To: Matt Moody; netbackup-l; nbu-lserv;
> > veritas-bu AT mailman.eng.auburn DOT edu
> > Subject: Re: [Veritas-bu] number of tapes
> >
> >
> > i am using DLT 40/80
> > how do i know the estimated data compression?
> > its a 1 time backup, keep for 1 month
> >
> > ----- Original Message -----
> > From: "Matt Moody" <mattm AT m-c-s DOT com>
> > To: "Sen" <discussion.groups AT gmx DOT net>; "netbackup-l"
> > <netbackup-l AT yahoogroups DOT com>; "nbu-lserv"
> > <nbu-lserv AT dsihost-srv01 DOT com>; <veritas-bu AT mailman.eng.auburn DOT 
> > edu>
> > Sent: Sunday, May 04, 2003 2:00 PM
> > Subject: RE: [Veritas-bu] number of tapes
> >
> >
> > > What tape drives will you be using?  How much estimated data
> compression?
> > > Are you talking a one-time backup or a backup rotation.  If
> > > rotation,
> how
> > > long will you be keeping the data?
> > >
> > > Matthew Moody
> > > MCSI
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> > > [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Sen
> > > Sent: Saturday, May 03, 2003 11:34 PM
> > > To: netbackup-l; nbu-lserv; veritas-bu AT mailman.eng.auburn DOT edu
> > > Subject: [Veritas-bu] number of tapes
> > >
> > >
> > > Hi,
> > > how many backup tapes do you think is required for 150GB of data?
> > >
> > > Thanks
> > >
> > > _______________________________________________
> > > Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> > > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> > >
> > >
> > >
> >
> >
> > _______________________________________________
> > Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> >
> >
> >
>
>
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo> /veritas-bu
>



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