Originally Posted by
fchan
I am surprised to hear here that servers can be so sensitive to mains problems. I guess the problem is that that their designers assume they are always fed from a nice clean UPS supply and, if the UPS fails to filter the surges, brownouts and spikes, the server has no designed in protection against them. The UPS manufacturers will probably claim it can never happen.
They are not. Anybody with the barest minimum of knowledge would deploy only server chassis fitted with two power supplies, each fed from diverse electrical feeds in the data center, backed up using different UPS's each connected to different diesel backup generators. Professional kit deployed by professionals can always be deployed with multiple power supplies. Short of a catastrophic event at the data center (bomb/flood/plane crash) you don't lose power on all power feeds.