What utter tosh! If you are serious about BCS/DR you plan for worse case scenarios...not that 'one system might fail'.
Example - if the entire DC went you have a secondary to take the load. That secondary would be some distance from the primary in case there was an incident covering a good size chunk of real estate. And if you have multiple DC's you have multiple recovery sites.
Unless of course the bean counters looked at the cost, decided that savings could be made (because of course bean counters are tech savvy) via a half arsed implementation requiring lots of hands on work to flip the bit. Actually it would not surprise me if their redundant systems are also located in the same DC. More cost savings innit!
Cost savings. huh. Your entire freakn business relies on data centres and you can't be arsed to have a decent BCS/DR solution.
I knew there was another reason I don't use twatter.
Pint raised to those twatter support staff that were under the kosh to sort things out because management are a bunch of numpty wankers.