To your point: You can have the best plan in the world, well rehearsed and battle tested; something in that last patch bugged out and took the system with it.

To your point: You can have the best plan in the world, well rehearsed and battle tested; something in that last patch bugged out and took the system with it. Now you're getting cursed out because the email, ivr, etc all said 1 hour downtime and it's been 4. Weekly scheduled downtime has value, but it's not a good idea for most.