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Date:      Sun, 23 Mar 2003 17:13:55 +0100
From:      Eric Veraart <eric@monkey-online.net>
To:        freebsd-isp@freebsd.org
Subject:   Server redundancy over 2 co-locations
Message-ID:  <5.2.0.9.0.20030323164230.047f5650@mail.monkey-online.net>

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Hello,

We currently have a few webservers at location 1, and are planning to place 
backup servers at location 2. Location 1 and 2 are seperated about 200km 
from each other. I want location 1 as the default location, and only put 
location 2 active when location 1 is down. This because location 2 is 
read-only, so the databases and documents on the two locations stay 
consistent. I've been looking at a few ways to achieve this;
-The world famous F5 Networks 3-DNS controller; You pay for a lot of fancy 
things that I don't need, because it can ballance the connection over 
multiple locations, which I don't need.
-Some sort of round-robin system, that runs on both locations (primary at 
location 1 and secondary at location 2) and checks if location 1 is still 
up, and otherwise points to location 2.

I don't know if I'll get problems with TTL times, DNS caches etc with the 
round-robin system, or with the 3-DNS controller.

What are your thoughts and experiences on this subject?

Greetings,
Eric



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