The problem is that management believes in 0% downtime. Fortunately, they have 50% downtime so its not too hard to sync downtime where they won't notice.

The worst case of downtime was when some muggins switched off a server that had been happily running for 3 years solid. Once it had cooled the raid array had seized solid. Oh, and when they came to do the restore they found it had never been included on the back-up schedule for the network.