Ian Levesque wrote:
> 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).

The future plan is to put the replication server in Seattle, WA (about 
30ms round trip as the bits fly).  If I find some time int he next week 
or so, I'll see about setting up a FreeBSD box with a dummynet bridge to 
test the effect of latency and packet loss on my replication.

Chris


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