[Bacula-users] Windows backups slow for remote (internet) backups only

I am having a problem where Bacula backups of Windows machines are 
running slow, only when saving to a storage daemon across the internet.  
Here's what I have so far:

-Bacula Director and Local SD, 2.2.8, running on Mandriva Linux 2008.1
-Remote SD 2.4.2, running on RHEL 4
-Windows FD, 2.4.3, running on Windows Server 2003 R2
-Remote connection is an 8Mbps line.

The trouble is, the backups of Windows machines to the remote storage 
never exceed about 3Mbps.

-I tried the exact same backup job, running to local storage, and it 
zipped right along (peaking at about 30 Mbps or so).
-Remote backups of Linux machines nearly reach the full 8Mbps available.
-Disabling/Enabling VSS did not make a difference.
-Disabling/Enabling Compression did not make a difference.
-I have tried various settings for Maximum Network Buffer Size, setting 
the same for both the FD and the SD, or also trying with just the FD
  - At 65535, the remote backups experience a lot of problems 
(eventually die).
  - At 32768, the remote backups are stable, just with this 3Mbps limit.
  - Above 32768, same limit
  - 16000, and they run slower.

-FTP file transfers from the Windows machines to the same remote server 
with the SD can also reach the full 8Mbps.

-I have not made any changes to the GlobalMaxTcpWindowSize registry 
entry (not yet willing to risk altering other services on the systems), 
but I checked and this is currently at 1677216.

-This problem has been present since before some recent upgrades to the 
various components (was at the 1.38 level, I did a lot of upgrading to 
try to resolve this issue).

All I know is that everything is pointing to the Bacula-Windows-Remote 
combination as having the problem.  I would appreciate any advice on 
some other settings I can try, and I am certainly willing to experiment 
or provide what additional information I can to help out.


Thanks for your help, and for a really slick network backup product.

Marc
Gridshield, S.A.






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