Years and years ago i was a Guide on Everquest. Back then it meant a lot more than it does now. We were mini GM's, in contact with the administration, etc etc.
Anyway, just before a very large expansion a player wrote in with a "suggestion". He was angry that all the servers were going to be taken down for 24 hours to apply the expansion. His message was something like this....
(keep in mind that at the time, there were 43 live servers and 2 test servers available to the public)
" I'm a server administrator, and i've found through experience that it's better to take servers offline 5-7 at a time, rather than you guys taking all 45 offline at the same time. It's more efficient that way"
Wow, did i want to reach out and smack this knowitall. He clearly was NOT a "server administrator", because if he'd had any experience with servers at all, he'd have known how much bullshit his suggestion was. Further to that, the 45 game servers were not represented by 45 physical machines. The 45 game servers were backed by more than 1000 physical machines. Some global, some individual, some purely redundant. It was near impossible to take "5-7 down at a time", because once you started updating the code, they simply could not talk to each other any more.