Hi,

The number is 262144 (aka 256 K) for 9940B's best performances.

Hth

F@b 

-----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
ida3248b AT post.cybercity DOT dk
Sent: mercredi 16 novembre 2005 09:13
To: Bob Stump; veritas-bu AT mailman.eng.auburn DOT edu
Cc: veritas-bu-admin AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] 9940B buffer setting

Hello Bob

I would start with the tech-note for tuning netbackup for STK9840 drives

Sorry that I can't remember the number

Regards
Michael

On Tue, 15 Nov 2005 16:47:52 -0500, Bob Stump wrote
> Because the data buffer size equals the tape I/O size, the value 
> specified in SIZE_DATA_BUFFERS must not exceed the maximum tape I/O 
> size supported by the tape drive or operating system. This is usually 
> 256 KB or 128 KB.
> 
> For Digital Linear Tape (DLT) drives, the number that seems to give 
> the best performance for SIZE_DATA_BUFFERS is 65536. Further 
> performance improvements can be achieved by increasing the value in 
> the NUMBER_DATA_BUFFERS file.
> 
> What is the optimum for STK 9940B?
> 
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