When I chose ZoneEdit to handle all the DNS stuff for birdhouse, one of the criteria was that they use widely distributed servers for maximum reliability. When you set up a zone with them, the nameservers assigned are in different states, so if one has a power outage or failure, the other is still there to pick up the slack. The nameservers assigned to birdhouse were in New York and New Jersey. This, of course, became a problem when half the Eastern seaboard went down in yesterday’s power outage. So we had a frustrating service blackout yesterday. I moved birdhouse DNS over to dotster last night, but that change of course needed all night to percolate through the DNS tables.
Interestingly, each domain I’ve set up for customers gets assigned a different pair of nameservers, and most of those pairs had at least one machine stay up. So most of my customer sites kept right on running through the outage, even though they’re on the same machine.