Re: "Tirelessly"?
This probably isn't a DR issue, but an HA one. So BA relies heavily on IT to know where it's aircraft, passengers, staff, luggage, spare crews, spare parts and everything else is, in real-time. So lots of interdependent data that would need to be synchronously replicated between the DCs at LHR so an accurate state table is maintained, even if X breaks.. But then if X does break, and there's data losss or corruption, getting back to a working state gets harder. Rolling back to a previous state may tell you where stuff was, but not where it is now.. Which can be a fun sizing challenge if you don't have enough transaction capacity to handle an entire resync.
Or maybe power & cooling capacity. Unusually for a UK bank holiday, the weather has been quite nice. So cooling & power demands increased in and around LHR, which includes lots of large datacentres. On the plus side, there'd be plenty of food for IT & power folks working at LHR given meals have probably been arriving, with no passengers to eat them.
Biting the hand that feeds IT
