I had a very different experience. I was responsible for about 100 Sun servers in the early 2000. To get to our server room, I had to go through another datacenter, where all was HP. We had every single week 1 or 2 outages (power supply, disk, mainboard, memory…) all the time. EVERY WEEk! Meanwhile, the other datacenter had just a few visits per year, for upgrades…