The following is from the Veritas Knowledge Base, and describes
NUMBER_DATA_BUFFERS_RESTORE.


Quite likely, the NUMBER_DATA_BUFFERS and/or SIZE_DATA_BUFFERS have been
changed on the NetBackup  Server.  However, there is another parameter,
NUMBER_DATA_BUFFERS_RESTORE that needs to be added and it should have
the same value as the NUMBER_DATA_BUFFERS.

 Where is this applicable?

 A system that has limited resources and the NUMBER_DATA_BUFFERS has
been set below the
 default 8, would be the ideal candidate to set
NUMBER_DATA_BUFFERS_RESTORE to ensure
 that the number of buffers does not exceed the memory of the system.

 The NUMBER_DATA_BUFFERS_RESTORE file is created in the
 /usr/openv/netbackup/db/config directory, the same as the
NUMBER_DATA_BUFFERS and
 SIZE_DATA_BUFFERS.  The file should contain the number of desired
buffers to be used for
 restores and should be the same value that is found in the
NUMBER_DATA_BUFFERS.


 TechNote Summary:

 TechNote Title:  A restore fails with an "Exit Status 11: System call
failed".
 TechNote ID:  233386
 Last Updated: February 20 2001 08:01 PM GMT

 This information in this TechNote applies to:

 Products:
            NetBackup (UNIX Platforms)    3.2
            NetBackup BusinesServer       3.4
            NetBackup DataCenter 


  
                             3.4"David A. Chapa" wrote:
> 
> Terry:
> 
> I wrote a rather extensive response to one of the other list members about
> buffers, how and when to use them.
> 
> I've attached it here.  As far as it inhibiting your ability to restore the
> data that was backed up, that is in regards to the SIZE of the data buffers
> and not the NUMBER.  You don't want your data buffers to exceed the SIZE of
> your hardware manufacturer's spec.
> 
> I hope this helps to answer your questions.
> 
> <><><><><><><><><><><><><><><><><><><><>
> David A. Chapa
> Consulting Manager
> DataStaff, Inc.
> 847 413 1144
> http://www.consulting.datastaff.com
> ---------------------------------------
> NBU-LSERV AT datastaff DOT com - Adv. Scripting
> 
> -----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 Spicuzza,
> Terry G
> Sent: Tuesday, April 10, 2001 10:54 AM
> To: 'veritas-bu AT mailman.eng.auburn DOT edu'
> Subject: [veritas-bu] Data Buffer sizes and restores
> 
> Our environment is running 3.2 with the default buffers for netbackup, but
> we want to bump this up to 16 data buffers with 64k blocks.  I heard
> somewhere, if you alter the buffers and do backups, there may be a problem
> with doing restores.  Has anyone altered the buffers and had any problems
> with doing restores?
> 
> ***********
> Terry G Spicuzza
> Collective Technologies
> Eaton Corp. (TCC)
> 34899 Curtis Blvd.
> Eastlake, Ohio 44095-4002
> voice: (440) 954-5626 fax:  (440) 954-5636
> pager: 800-946-4646 pin#1438201
> alphanumeric: 1438201 AT mobilecomm DOT net
> email: spicuzza AT colltech DOT com
> 
> To check Netbackup status please go to http://netbackup.tcc.etn.com
> 
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> 
>   ------------------------------------------------------------------------
>                                         Name: Tuning NetBackup_ideas.doc
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-- 
Douglas Ritschel
Fujitsu Network Communications
Two Blue Hill Plaza, Sixth Floor
P.O. Box 1609
Pearl River, NY 10965
Ph: 845-731-2101 Fx: 845-731-2011
Douglas.Ritschel AT fnc.fujitsu DOT com