actually it's
\HKEY_Local_Machine\SOFTWARE\VERITAS\NetBackup\CurrentVersion\Config
add a new string
SIZE_DATA_BUFFERS with the value in bytes maximum 65536 because NT only
allows 64k buffers
NUMBER_DATA_BUFFERS I usually keep it a power of 8, 1,2,4,8,16,32,64
but I'm anal
Bob
-----Original Message-----
From: David A. Chapa [mailto:david AT datastaff DOT com]
Sent: Friday, November 10, 2000 8:10 AM
To: Keahey, Ricky L; Long, Matt; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] improving backup speed on NT backups
\veritas\netbackup\db\config\SIZE_DATA_BUFFERS
and NUMBER_DATA_BUFFERS
do not have any trailing spaces in these files, no comments, etc.
Here is the technote on the two parameter files
http://seer.support.veritas.com/docs/183702.htm
David
-----Original Message-----
From: Keahey, Ricky L [mailto:ricky.l.keahey AT intel DOT com]
Sent: Friday, November 10, 2000 10:00 AM
To: 'David A. Chapa'; Long, Matt; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] improving backup speed on NT backups
I am having this same issue except it is in a SAN environment and some of my
media servers. I have been looking for the place to change these settings,
but can't find them. Can you point me in the right direction. I have a
total NT environment.
Thanks,
Rick
-----Original Message-----
From: David A. Chapa [mailto:david AT datastaff DOT com]
Sent: Friday, November 10, 2000 7:29 AM
To: Long, Matt; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] improving backup speed on NT backups
Matt:
Create /usr/openv/netbackup/logs/bptm on your media server that is backing
up your NT machines
Run some test backups and review this log.
You will want to look for a line
waited for full buffer
-or-
waited for empty buffer (this **MAY** mean an increase in data buffers could
be used)
this will let you know how long it waited for a buffer to be filled prior to
writing to tape.
If there are considerable delays you may want to investigate the network
between your media server and your NT clients. Typical problems are
AUTO-NEGOTIATE on your NT machines and AUTO-NEGOTIATE on switches in the
closet. If all of that checks out, and you still aren't satisfied with the
results, you **MAY** want to look at the NUMBER_DATA_BUFFER and
SIZE_DATA_BUFFERS config options for tuning your performance. Please keep
in mind, that you want to make sure that you don't adversely affect you
current clients. Believe it or not, in the most recent NT environment that
I have been architecting, I found that I needed to reduce the SIZE of the
databuffer and increase the NUMBER of the data buffers. This seems to have
increased the speed, I need to follow up with my client to review the actual
results but the preliminary numbers looked good.
Just my two cents worth
David
-----Original Message-----
From: veritas-bu-admin AT Eng.Auburn DOT EDU
[mailto:veritas-bu-admin AT Eng.Auburn DOT EDU]On Behalf Of Long, Matt
Sent: Thursday, November 09, 2000 11:07 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] improving backup speed on NT backups
Hello,
Does anyone know how to improve network performance for NT client
backups? Currently, I am seeing about 4 to 5 mps per second on my UNIX
servers but I am only seeing lass than a 1 mps for my NT systems. Any
recommendations out there for this scenario? Thanks
1 nt_filesystem nt_incrimental nodename master_server
87538 100% 200.075 11/08/2000 5:09:24 PM 00:09:37 11/08/2000
5:19:01 PM
Matt Long
Systems Administration
Marriott International
301-696-2690
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