Originally Posted by
Smott999
So no separate data center? Or backup system on a different power circuit?
This is the fact that makes no sense. If you are running a global system and it must be up and running 24/7 then you must not have all your systems in one place. Not only should there be a separate backup system it must be a geographically separate backup system ideally in another State - Delta could have theirs at MSP. Both the ATL and MSP systems should be running in parallel, with their own local backup for fault tolerance. Both should be able to support all operations 24/7, but when both are up they could share the load and keep each other in synch. Banks do this all the time. If ATL had gone down under this scheme only those people in the ATL center would have noticed. All users would have the same service from the one site.
As said before this sounds like a beancounter enforced lack of fault tolerance.