agreed... one point to add and this is probably what you're doing.  Don't set
up a STU with the same number of drives that media server has access to (which
are also all shared with other media servers).  It needs to be set to only the
nuber of drives you want the STU to use, not the total number.

in example below there is 1 library with 8 drives shared by all servers.

media server   physical drives           STU       drives in STU
media1         8 drives            media1-lib1     8 drives
media2         8 drives (same)           media2-lib1    8 drives
media3         8 drives (same)           media3-lib1    8 drives

In this example media1 would do everything.  media2 and media3 would not get
used because there is never any free drives for them.

A better way would be to do this...

media server   physical drives           STU       drives in STU
media1         8 drives            media1-lib1     3 drives
media2         8 drives (same)           media2-lib1    3 drives
media3         8 drives (same)           media3-lib1    2 drives


 - Scott



                                                                                
                                                   
                    "David A. Chapa"                                            
                                                   
                    <david AT xbpadm-commands DOT com>          To:     "Thomas 
Betts" <tomb AT iarchive DOT com>,                               
                    Sent by:                             <veritas-bu AT 
mailman.eng.auburn DOT edu>                                       
                    veritas-bu-admin AT mailman DOT eng.        cc:             
                                                          
                    auburn.edu                           Subject:     RE: 
[Veritas-bu] (no subject)                                
                                                                                
                                                   
                                                                                
                                                   
                    03/01/2002 11:50 AM                                         
                                                   
                                                                                
                                                   
                                                                                
                                                   




SSO doesn't play a role in the selection.  This is a function of NetBackup's
core operation to select a storage unit.

>From what I understand it works like this.

The storage unit selection is done in a round robin fashion starting with
the first storage unit alphabetically, once all the drives in that storage
unit are used, it goes to the next storage unit in the list alphabetically,
so and so forth.

I haven't seen this documented anywhere, its just from my recollection as a
consultant with OpenVision years ago.

<><><><><><><><><><><><><><><><><><><><>
David A. Chapa
NetBackup Consultant
DataStaff, Inc.
http://www.consulting.datastaff.com
847 413 1144
---------------------------------------
NBU-LSERV AT datastaff DOT com - Adv. Scripting
http://www.xbpadm-commands.com

-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Thomas
Betts
Sent: Friday, March 01, 2002 11:13 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] (no subject)


Hello,

I was wondering if anyone knows how SSO picks a media server for a client
 not media server ). It seems all my clients are writing to the same media
server when I choose any available Storage Unit.

thanks,


Thomas Betts
Sr. Systems Engineer


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