Gurus: Can I setup multiple name servers at different hosts for 1 domain name?

I have been trying to think of an inexpensive way to produce some level of network redundancy for a few clients.

What I was wondering is this:

If I was to have two seperate hosting accounts at HostA and HostB which would be using different Data Centers. And for the domain I setup 4 nameservers: NS1.HostA.com, NS1.HostB.com, NS2.HostA.com and NS2.HostB.com

If HostA went down would the domain automatically resolve to HostB?

Of course, if this does work I'm not sure how I would keep the Databases sync'd.

Thanks for your input!

 

 

 

 

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