If it's a robotic library, it should continue backups on previously written
tapes if they tapes are in the same pool and the images have the same
retention (by default, retentions aren't mixed on a single tape, this can be
changed but it's not recommended.)

Otherwise, the number of tapes initially grabbed for a backup at the start
of the job is a function of number of streams, jobs-per-client limitation, &
the multiplexing setting. Number of simultaneos streams (limited by the jobs
per client) divided by the Mux setting is the initial number of tapes loaded
(not to exceed the number of available drives, of course).

Subseqently backups jobs should be appended to the already written tapes if
they're sharing the same pool and retention period.

HTH - M

-----Original Message-----
From: Sen [mailto:discussion.groups AT gmx DOT net]
Sent: Monday, October 06, 2003 10:03 AM
To: Donaldson, Mark; Pearce, Andrew W.; 'Steve Dvorak'; netbackup-l;
nbu-lserv; veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] tape usage


its a P1000 library
how can i restrict the backup to write to both tapes fully before loading
other free tapes?

----- Original Message ----- 
From: "Donaldson, Mark" <Mark.Donaldson AT experianems DOT com>
To: "'Sen'" <discussion.groups AT gmx DOT net>; "Pearce, Andrew W."
<apearce AT kforce DOT com>; "'Steve Dvorak'" <sdvorak AT veritas DOT com>; 
"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: Monday, October 06, 2003 11:51 PM
Subject: RE: [Veritas-bu] tape usage


> So this is a standalone or stacker drive unit?
>
> If it's ejecting the tape before full and loading the next in line, you
have
> to either have everything at the same retention or use the
> ALLOW_MULTIPLE_RETENTIONS.  You also can use the NO_STANDALONE_UNLOAD
> keyword to keep the tape from being ejected before it's full.
>
> -M
>
> -----Original Message-----
> From: Sen [mailto:discussion.groups AT gmx DOT net]
> Sent: Monday, October 06, 2003 7:39 AM
> To: Pearce, Andrew W.; 'Steve Dvorak'; netbackup-l; nbu-lserv;
> veritas-bu AT mailman.eng.auburn DOT edu
> Subject: Re: [Veritas-bu] tape usage
>
>
> i have 2 drives in the loader.
> 1 job with 2 streams, mutiplexing set to 1
> any help?
>
> ----- Original Message ----- 
> From: "Pearce, Andrew W." <apearce AT kforce DOT com>
> To: "'Steve Dvorak'" <sdvorak AT veritas DOT com>; "'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: Monday, October 06, 2003 7:42 PM
> Subject: RE: [Veritas-bu] tape usage
>
>
> > How many tape drives to you have in you loader?
> >
> > If you have 4 drives and 4 or more jobs scheduled to fire at once
(without
> > multiplexing) you will pull 4 tapes, one for each available drive.  If
> this
> > is the case, you could try (in order of personal Preference):
> > 1. Grouping the jobs into 1 or 2 policies and change the "Limit Jobs Per
> > Policy" to 1 or 2 accordingly.
> > 2. Staggering your schedule
> > 3. Multiplexing if it is justified
> > 4. Only allow 2 drives at a time for backup
> >
> > Andrew
> > -----Original Message-----
> > From: Steve Dvorak [mailto:sdvorak AT veritas DOT com]
> > Sent: Monday, October 06, 2003 12:07 AM
> > To: 'Sen'; netbackup-l; nbu-lserv; veritas-bu AT mailman.eng.auburn DOT edu
> >
> > Check out the "Allow multiple retensions" capability.
> >
> > Steve Dvorak
> >
> > -----Original Message-----
> > From: Sen [mailto:discussion.groups AT gmx DOT net]
> > Sent: Saturday, October 04, 2003 7:46 PM
> > To: netbackup-l; nbu-lserv; veritas-bu AT mailman.eng.auburn DOT edu
> > Subject: [Veritas-bu] tape usage
> >
> >
> > hi,
> > I have a pool if 10 tapes which is configured for full backup. This
backup
> > only requires 2 tapes, however, if there are 10 tapes in the library it
> will
> > use about 4 tapes.
> >
> > How can i force NB3.4 to continue appending data on those tapes which
> still
> > have free space before moving on the other new tapes ? 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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>
>