On Sep 15, 2009, at 7:12 PM, Chris Robertson wrote:

> ...even though they have more than a mile of physical separation.  I
> don't currently have good data as to the bandwidth utilization during
> backups (the DRBD config is set to limit it to 10M, which is about
> 110Mbit/sec with TCP overhead), but the BackupPC_nightly and
> BackupPC_trashclean give an average 5Mbit/sec combined.  Over a 24  
> hour
> period the servers have passed nearly 80GB of data between them (78GB
> from the source, 2GB from the target).
>
> There has been no discernible effect to the amount of time it takes to
> backup my hosts.
>
> If you have any questions, or feel there is anything I was not clear
> about, feel free to ask.

Thanks for your report. With that fiber link, it's no wonder you get  
LAN-like results. What I'm curious about is if the IO requirements of  
BackupPC would allow for an offsite replication over a typical WAN  
link (say, 20-30ms round-trip).

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