Of course I've known that a DR plan isn't valid until you've tested it against your production environment, but I'd never heard that Bell System story before. I

Of course I've known that a DR plan isn't valid until you've tested it against your production environment, but I'd never heard that Bell System story before. It's inspirational - run 24 hours in emergency mode each year, with the normal way turned off/disconnected, don't just do failover/failback. Thanks for bringing it up!