- I do not know Solaris deeper so that i know the reason. But you can find the 
statement in any NW Installation Guide.
   Unfortunately, you have to read very carefully to get to the point. And i 
only found it in the NW 7.6.0 Installation Guide:

   "However, NetWorker version 7.6 does support DSN installed in a Solaris 10 
local zone to backup directly to a physically attached device without sending 
data across
   the IP network. It manages the sharing of a device between multiple 
dedicated storage nodes or storage nodes that are installed in multiple local 
zones of a single
   physical host, as long as all are contained within a single NetWorker data 
zone."

   I recognize this as the key point.

 - In general, the only limitation for the number of devices depends on the NW 
license, your 'edition'. But 4 devices is usually not an issue for a 'Network 
Edition' which is required to
   implement Storage Nodes. You can have up to 16 devices + 16 more for each SN 
license.

 - You can distribute the 'media load' by setting up pools for the appropriate 
clients.

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