Good idea,

>>From the unix world myself, however we have overcome the blocksize limit
on our windows media servers with Microsoft KB907418.

2003 SP1 I presume

Anyhow I think they have now bundled the fix into the next SP release
and is therefore not available for download. I have a copy of the fix if
you need it.

Dave



-----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 Martin,
Jonathan
Sent: 21 August 2007 13:34
To: Veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] NDMP Performance

I put in a call to Symantec Tech Support on this, given that its not
documented anywhere and the tech indicated this is the write to tape
block size.  So given that your tape drive can handle it, setting this
as high as 256KB can net you performance improvements.  I however am on
Windows, so 64K seems to be it for me.

-Jonathan 

-----Original Message-----
From: Clooney, David [mailto:david.clooney AT bankofamerica DOT com] 
Sent: Tuesday, August 21, 2007 4:31 AM
To: Len Boyle; Martin, Jonathan; Veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] NDMP Performance

I was under the impression that if the drives are directly attached
there is not a lot that can be done from an NBU point of view.

If you are running a 3 way scenario then the touch file could possibly
make a difference, I seem to remember from the past that if you are in a
3 way setup you can change the way the NDMP mover agent starts with
regard to buffers.

Dave

-----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 Len
Boyle
Sent: 21 August 2007 04:06
To: Martin, Jonathan; Veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] NDMP Performance

The answer may depend on what device is at the other end of NDMP. 
I was told that with NetApp NDMP that changing the buffer did not change
performance due to the way that the WAFL filesystem handled things. 
It would be interesting to revisit this and see if they had made any
changes to enable larger buffers sizes improve performance. 

Some of the other NDMP devices with different filesystems may show an
improvement.

len

-----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 Martin,
Jonathan
Sent: Monday, August 20, 2007 3:12 PM
To: Veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] NDMP Performance

Anyone know anything about the SIZE_DATA_BUFFERS_NDMP touch file?  Is
this even still valid?  I can't seem to find anything about it in NBU
documentation, just a reference in the archives of this mailing list.
Is this worth investigating as a performance enhancer for NDMP?

-Jonathan

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