Registry Changes for Optimizing NTBackup
The first optimization to make for NTBackup performance is to change some
registry keys that affect buffering. These changes can have a very positive
impact on performance when writing to tape, and a smaller impact when
writing to disk. They are as follows (in batch file syntax):
reg add "HKCU\Software\Microsoft\Ntbackup\Backup Engine"
/v "Logical Disk Buffer Size" /t REG_SZ /d 64 /f
reg add "HKCU\Software\Microsoft\Ntbackup\Backup Engine"
/v "Max Buffer Size" /t REG_SZ /d 1024 /f
reg add "HKCU\Software\Microsoft\Ntbackup\Backup Engine"
/v "Max Num Tape Buffers" /t REG_SZ /d 16 /f
These registry changes double the default values. Do note that they affect
HKEY_CURRENT_USER, and not HKEY_LOCAL_MACHINE as you might expect.
Therefore, you should execute NTBackup under the desired user to create the
registry key before you attempt to set the above registry values.
Regards,
Michael B. Smith, MCITP:SA,EMA/MCSE/Exchange MVP
My blog: http://TheEssentialExchange.com/blogs/michael
Link with me at: http://www.linkedin.com/in/theessentialexchange
From: Joseph L. Casale [mailto:[EMAIL PROTECTED]
Sent: Tuesday, October 07, 2008 11:59 AM
To: NT System Admin Issues
Subject: RE: Comparing NT Backup speeds
Michael,
What are these tweaks you speak of?
jlc
From: Michael B. Smith [mailto:[EMAIL PROTECTED]
Sent: Tuesday, October 07, 2008 6:26 AM
To: NT System Admin Issues
Subject: RE: Comparing NT Backup speeds
Well a local device will usually be faster than a remote device.
Ntbackup, with the registry tweaks, gives me about 1 GB per minute locally.
But I dont have a dat-72 to compare to. My home GB LAN with a cheap crappy
switch copies about 50 MB/min. So Im thinking that two hours seems more
likely than 9 hours.
Regards,
Michael B. Smith, MCITP:SA,EMA/MCSE/Exchange MVP
My blog: http://TheEssentialExchange.com/blogs/michael
Link with me at: http://www.linkedin.com/in/theessentialexchange
From: HELP_PC [mailto:[EMAIL PROTECTED]
Sent: Tuesday, October 07, 2008 7:28 AM
To: NT System Admin Issues
Subject: R: Comparing NT Backup speeds
Yes the DAT device is local.
Not applied registry tweaks
GuidoElia
HELPPC
_____
Da: Michael B. Smith [mailto:[EMAIL PROTECTED]
Inviato: martedì 7 ottobre 2008 13.05
A: NT System Admin Issues
Oggetto: RE: Comparing NT Backup speeds
Have you applied the standard registry tweaks to increase the ntbackup
buffer size?
Is the dat-72 locally attached?
Regards,
Michael B. Smith, MCITP:SA,EMA/MCSE/Exchange MVP
My blog: http://TheEssentialExchange.com/blogs/michael
Link with me at: http://www.linkedin.com/in/theessentialexchange
From: HELP_PC [mailto:[EMAIL PROTECTED]
Sent: Tuesday, October 07, 2008 1:59 AM
To: NT System Admin Issues
Subject: Comparing NT Backup speeds
In a network 10/100/1000 copper a NT backup of the complete server to a Qnap
device RAID-1 takes about 9 hours with verify (about 50GB) versus DAT-72
with separate card that takes half the time .
Should be considered normal ?
TIA
GuidoElia
HELPPC
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