We've had this happen in our small onsite datacenter. A single phase out of the 3 changed waveform after a lightning strike on a utility pole. The power monitor to turn on the generator didn't see this a problem, but the UPS did. So the UPS was on for several minutes and I noticed some of the ceiling lights out that depended on that phase. Fortunately I and another employee were there and turned on the manual transfer to put us on generator power.
Disaster backups are hard to test as to do it properly they have to be integration tested, and doing so might break production. Sure your generator might power on for 5 minutes a month and make people happy, but there are many unforeseen things that are hard to test for.
Disaster backups are hard to test as to do it properly they have to be integration tested, and doing so might break production. Sure your generator might power on for 5 minutes a month and make people happy, but there are many unforeseen things that are hard to test for.