I think I understand the question :-(
If you want more streams to write to one media, you need to ensure the
storage unit multiplexing is set higher (ie: lets say 10 as an example) and
the Backup Policy SCHEDULE needs to be set to 10. This also assumes you have
10 streams in your policy.
 
As long as Max Concurrent Jobs is set to a high number (ie: 99 jobs) then 10
streams would run concurrently at the same time, on the same media.
 
If you want more streams spread across more media, the schedule within the
policy should be set lower. In this example, if I have 4 tape drives and I
set to schedule to 3 streams, then essentially all 4 tapes drives would be
used for the backups (based on the fact the tapes drives are not in use).
 
Does this help answer the question? Or have I gone off the rails .....
 
 

Regards

Simon Weaver
3rd Line Technical Support
Windows Domain Administrator 

EADS Astrium Limited, B23AA IM (DCS)
Anchorage Road, Portsmouth, PO3 5PU

Email:  <mailto:Simon.Weaver at Astrium-eads.net> Simon.Weaver at 
Astrium-eads.net

-----Original Message-----
From: Veritas Netbackup [mailto:backupicici at gmail.com] 
Sent: 05 September 2006 12:46
To: veritas-bu at mailman.eng.auburn.edu
Subject: [Veritas-bu] Netbackup VTL tuning


Hi List,

We have a Clariion Disk Library with MPx set to 4.

At the momment the admins fire backups and after 4 streams of backup are
started, a new media is used to write the backup.

Since the CDL tapes can grow from a minimum of 4 GB to whatever size is
available in the volume, it seems to me that the tape utilization is not
optimum.

As a consequence I need to consequently free medias and add the to
SCRATCHPOOL OR provide less medias in SCRATCHPOOL so as to limit them from
firing too many consequitve backups.

Any suggestions for this scenario??? Shd we disable multistreaming in the
policy??? Will this increase tape util??

Any suggestions for a VTL & netbackup combination to increase performance
and tape utilization are welcome.

Regards,
PP BIJU KRISHNAN




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