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How resilient is Stackoverflow to outages? Is there an automatic failover process?

The Stackoverflow websites were down for maintenance for 2 hours yesterday (5pm to 7pm PST on a Saturday).

Here's the only info I have at the moment:
-That blog post (above) mentions they have a backup database server.
-The Stackoverflow podcasts imply they only use one main web server, with no load balancing - which surprised me a bit.

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They allocated 2 hours, but it was really only about 45 minutes. – Kyle Cronin Dec 6 '09 at 16:41
up vote 2 down vote accepted

They use load balancing. And I think for a Q&A site the resilience is good enough.

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Podcast #68 goes into more detail about this: Typical that it was the next one on my playlist! – Dan J Dec 7 '09 at 15:43

I personally don't have a problem with maintenance outages of a few hours every 4-6 months.

I just don't see the Trilogy as a mission critical service where we cannot have downtime.

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Yes, it seems reasonable. I was surprised at the choice of time for the maintenance window, but I see you've explained it was a typical low point in weekly traffic in a comment here:… – Dan J Dec 7 '09 at 1:05

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