Again, that doesn't matter because everyone knows the grid isn't 99% reliable. They just pull the big power switch to the whole building and watch all the backup systems work. If anything fails it was broke already and they fix/replace it. Because this happens often they have confidence that most systems will work - even where it doesn't computers fail unexpectedly anyway and so they have redundancy of computers anyway (and if it is really important redundancy of a data center in a different state/country)

Synchronizing generators is a thing, but it isn't useful for this situation since they need to be able to handle the sudden without warning power loss where generators cannot be synchronized anyway.

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stevetron 3 days ago | parent [-]

How often does that inverter burn-out a transistor? Is there a backup inverter? Do you keep replacement transistors on-site?

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Bender 3 days ago | parent | next [-]

Commercial inverters are massive and highly redundant. They do fail but it is very rare and there are contractors that can be on site to fix things very quickly. A properly engineered system can run in a degraded state for a prolonged period of time.

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hdgvhicv 2 days ago | parent | prev [-]

My data centres have two separate supplies through two separte ups with two seperate generators, kit is striped across each one.

Of course that doesn’t help for fire/flood etc which is why we have critical workloads in two dcs.

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bluGill 2 days ago | parent [-]

I once worked in a building that had two separate connections to the grid which went to different substations. Their servers have more than one power supply as well so that either grid could go down. While somewhat of an outlier, it is an option if you care about this.

	▲	hdgvhicv 20 hours ago \| parent [-]
		That goes without saying, you still need at least one on an ups and generator though. Dual power supply services and dual supplies are or so for any important hosting environment.