Check this setting(P58 in the vault admin guide): 

To set the maximum number of Vault jobs
1.
In the NetBackup Administration Console, expand NetBackup Management.
2.
Expand Host Properties.
3.
Select Master Server.
4.
In the right pane, select the master server and then Actions >
Properties.
5.
Select Global Attributes Properties.
6.
Specify the maximum number of vault jobs that can be active on the
master server. The greater the maximum number of vault jobs, the more
system resources are used.


A

-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of dy018
Sent: 20. november 2007 16:23
To: VERITAS-BU AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Multiple Vault Jobs


yes, i'm using NBU 6.0 but not very sure abt this limitation tho.
The job is running but no duplicate jobs trigger.

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Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
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