On Wed, 2009-01-07 at 21:20 +1100, Adam Goryachev wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> William McKee wrote:
> > I use VMware on a co-lo server which has 3 guestts that all get backed
> > up by BackupPC. I could identify that the host was transmitting massive
> > amounts of data (130Gb) which appeared to be coming from one of the
> > three guests. However, I couldn't figure out which guest was pushing out
> > the excessive data.
> >
> > I went through the usual log files without much luck. I then checked the
> > ifconfig output which all looked normal inside the hosts. Once I finally
> > looked at the BackupPC logs for the guest server, I realized what was
> > happening and corrected the issue by removing my bad entry. I also added
> > --bwlimit to the RsyncArgs setting in config.pl to control maxing out my
> > bandwidth.
> >
> > However, this all took longer than I'd have liked. I'm stumped as to why
> > the data transmitted off of the guest did not show up in the ifconfig
> > output. I know that the guest is sending data via rsync based on the
> > logs. However it's not showing up in the ifconfig stats (see below). Is
> > this due to the way that rsync works? I was sending about 450Mb of data
> > every 1-2 hrs from 8pm - 6am (I can send the logs if that would be of
> > any help). I've included below the ifconfig outputs for the host
> > (massive TX bytes) and the guest (normal TX bytes). I would have
> > expected a corresponding amount of TX bytes for the guest. Thanks for
> > any insight.
>
> I would suspect vmware has something to do with that. Try creating
> traffic with any other tool, and it likely won't be counted in the way
> you think it should as well.
>
> Another option is perhaps the counters wrapped due to the amount of
> data... so if they wrapped recently, then the values will be very small,
> even though a huge amount of data has been transmitted.
>
> There is nothing special that rsync does to cause it's bandwidth not to
> be counted normally (AFAIK).
>
> Regards,
> Adam
I think Adam is spot on. AFAIK, ifconfig receives its byte data from the
proc subsystem and on 32 bit systems will wrap at 4 gigs.
Regards,
Royden
------------------------------------------------------------------------------
Check out the new SourceForge.net Marketplace.
It is the best place to buy or sell services for
just about anything Open Source.
http://p.sf.net/sfu/Xq1LFB
_______________________________________________
BackupPC-users mailing list
BackupPC-users AT lists.sourceforge DOT net
List: https://lists.sourceforge.net/lists/listinfo/backuppc-users
Wiki: http://backuppc.wiki.sourceforge.net
Project: http://backuppc.sourceforge.net/
|
