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I am attempting to formulate a Disaster Recovery strategy for our company website and would like to know if the following is even possible theoretically or practically?

If I ask our Domain registrar to set our Domain DNS TTL to 3600 permanently, then host our website on a second server that mirrors the primary server will I theoretically be able to switch from primary to secondary in 1 hour limiting our website downtime.

Any advice would be greatly received.

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2 Answers 2

That should work fine. Operating systems and browsers may cache DNS lookups, so users may see the downtime as longer. (More info here: http://dyn.com/web-browser-dns-caching-bad-thing/).

You could reduce the TTL even further, down to the time it takes your mirror to catch up with changes on your main site.

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Thank you Paul. –  David Clee Feb 1 '12 at 12:15

Most providers won't let you permanently set a low TTL because it significantly increases the load on their servers. Others charge more for a more dynamic service. So it is worth checking that they will do it before you count on it.

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Hi James,I've checked with ours (123-reg) who seem happy to do this permanently so does that mean you see no other problem with the idea? –  David Clee Feb 1 '12 at 14:24

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