BackupPC-users

Re: [BackupPC-users] Is there a speed setting?

2009-08-17 15:19:34
Subject: Re: [BackupPC-users] Is there a speed setting?
From: Filipe Brandenburger <filbranden AT gmail DOT com>
To: jeremy AT biochem.uthscsa DOT edu, "General list for user discussion, questions and support" <backuppc-users AT lists.sourceforge DOT net>
Date: Mon, 17 Aug 2009 15:16:01 -0400
Hi,

On Mon, Aug 17, 2009 at 14:55, Jeremy Mann<jeremy AT biochem.uthscsa DOT edu> 
wrote:
> Just curious if there is a bandwidth speed setting for BackupPC because
> I'm not seeing a lot of bandwidth when the backups occur. All my servers
> are on gigE and I'm not even seeing 50Mbit speeds between the servers and
> backupPC server.

50Mbps is actually quite a lot, and it's probably close to the
bottleneck of your disks. You should use "iostat" on client and server
while backups are running to see if you're getting 100%util of the
disks that are being backed up.

In BackupPC's case, as it will transfer only the differences, it will
end up reading from disk much more than it actually sends on the
network, so using network bandwidth as a measure of backup speed will
not be very accurate.

HTH,
Filipe

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