DNS settings for moving sites to new server?

We will be moving some sites from one server to another. What settings should we adjust in the DNS zonefile so that the transition time will be minimized when we switch an account to the new server and update the IP # in the zonefile?

ie, which setting (TTL, Refresh, etc...) and to what value (2 hours, 20 mins., etc...) would be most effective to facilitate a very brief crossover period to minimize problems with dynamic content and e-commerce order systems.

Thanks for any tips!

John C.

 

 

 

 

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