Loud Sound From Fire Alarm System Shuts Down Nasdaq's Scandinavian Data Center

Found on Bleeping Computer on Friday, 20 April 2018
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These systems work by releasing inert gas at high speeds, a mechanism usually accompanied by a loud whistle-like sound. With non-calibrated systems, this sound can get very loud, a big no-no in data centers, where loud sounds are known to affect performance, shut down, or even destroy hard drives.

Nasdaq said there weren't enough servers in the whole of Sweden to replace the destroyed ones, and had to import new machines.

Pretty sure they are now trying to find out who was supposed to calibrated those systems.