If we can believe that we'll believe anything.
Anyway, what the h*ll does that mean??
An emergency is......e.g. a fire........maintenance is........er!!......should be planned? How do you get a mix of those two???
What is "emergency maintenance"? Answers on a postcard please!!
The only excuse is a power failure and any decent datacenter should have a backup power strategy for that.
All the pro's on here know that systems should be designed clustered, high availability, etc (typical outage 20 seconds). Who are they trying to kid?