Reply to post: Re: DR Testing Failure

Pickaxe chops cable, KOs UKFast data centre

Lysenko

Re: DR Testing Failure

If the UPS is sized for the few minutes during which the generators are supposed to get their act together you might have maybe 30 degrees rise before the power fails, so not yet tripping overtemp safeties.

The problem with that is that the UPS sizing is always based on full DC capacity whereas a cold aisle containment unit is a semi-sealed micro-climate. That means that in a part filled DC it is possible for a given CAC unit to keep on trucking for several times longer than the design calculations suggest and ambient cooling doesn't help because the CAC is semi-sealed. In the case I referred to above, the equipment was still operating on UPS at least half an hour after HVAC went down.

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