On Wed, 5 Sep 2007, Parker, Matthew wrote:

> What type of benchmark testing are you looking for?
>
> -----Original Message-----
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu 
> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Justin 
> Piszcz
> Sent: Wednesday, September 05, 2007 4:36 AM
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] Tuning backups.
>
> There are several ways to tune backups.
>
> 1. NET_BUFFER_SZ
> 2. SIZE_DATA_BUFFERS
> 3. NUM_DATA_BUFFERS
>
> While these help a little, I found by reading the NBU6 optimization document 
> I improved speed by 2x in some cases (need to do some more
> verification) using 256k buffers in the kernel (Linux) st driver rather than 
> the default of 32k and also using more of them.
>
> Anyone here do a LOT of benchmark testing?

So far, it would appear that using general optimizations in NetBackup
only help so much, such as the ones mentioned above with the exception
of NET_BUFFER_SZ, I still need to look into that one.

The buffers in the kernel appear to help much more, in Linux 2.4 the
default buffers for the st tape driver are 32k and there's four of them.

I want to know every possible tunable parameter and its effect on the
system for the fastest backup possible.

Justin.

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