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Testing the whole stack
This morning, around 6.00, we tested the whole stack. A test we will run on a monthly basis to make sure that the powersupply is stable and reliable, even if the mains fail.
Synchronous failover
What our setup allows us to do, is a synchronous failover. When we turn the key, the ATS will power up the generator, which will be delivering power in a few seconds. The ATS will then wait for the two sinusses of the generator and mains to overlap and when that happens, it will switch over to the other power source. The mains run at a steady 50Hz, but the generator runs between 49.9 and 50.1 Hz, so eventually, they will overlap. Using this technique, the switch over can happen without any interruption of the power supply.
That was the first test we did this morning. Both switching from mains to generator and vice versa worked without any interruption.
After that, we performed a black building test. The engineer switched the mains down, after which the ATS detects loss of power. It starts the generator and waits for stable power supply. Obviously, this causes the lights to go off. The datacenter remains powered because it is protected by the UPS. When the ATS detects the power coming in from the generator, it will switch to generator power.
After ~ 15 minutes, we reinstated the main power supply and the ATS performed a synchronous failback. After the administrative tasks of checking all the server monitoring, temperatures and fuel-levels, we can happily say that all tests have been executed succesfully!
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