[CentOS] High Availability using 2 sites -- yep, "propogation."

> Some organizations set very low TTLs on the DNS records for their public 
> hosts. Google's are only five minutes. That wouldn't allow real-time 
> failover, but it's fairly quick as those things go.

we do this BUT there are TONS of DNS servers out there that seem to 
ignore TTL's and don't get me started on web cache's

thanks