Ravi Channavajhala said:

>Is it possible to do network load balancing across several
>physical interfaces in a media server i.e., one storage
>unit being shared by several netbackup slave server
>definitions eg., backup-e0, backup-e1, backup-e2?  The
>primary definition is backup (nodename).  All these interfaces 
>are on different subnets.  The storage unit is defined for
>backup instance only.
>
>I already defined these in bp.conf on the master as well as
>the slave.  What I dont understand is, how does the master
>make a determination to direct a specific backup stream to
>a specific network interface.  Thanks.
>

There are 2 streams of traffic for each client.
- backup stream
- catalog stream

A server will automatically talk to another machine using the interface with 
the best metric. On Unix, if you've got 2 interfaces, the system will use the 
interface on the network its trying to reach.

The client will need to know about each server name.  So, what you probably 
want to do is:

1. Set up multiple "A" records/IP's for your master server.
2. Set up 1 storage unit and makes it owned by whatever interface name you 
consider primary.
3. List all of the "aliases" for the master server in the bp.conf file on 
master and slaves.

All backup traffic will take the optimal route. All catalog traffic must get 
sent to "master" which is the top line in the bp.conf file.

You will have asymmetric traffic flows, but your backup data will tape the 
optimal route.



-- 
Andy Steingruebl              | e-mail: steingra AT pprd.abbott DOT com         
 
Unix Systems Admin/Programmer | phone:  (847) 935-4728                    
Unix/Network Security         | fax:    (847) 935-0142                    
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