Slatterz writes "Google has apologised for the two-and-a-half-hour Gmail outage on Tuesday morning, and admitted that the cause was down to data center maintenance. 'Lots of people around the world who rely on Gmail were disrupted during their waking and working hours, and we are very sorry. We did everything we could to restore access as soon as possible, and the issue is now resolved,' said Gmail site reliability manager Acacio Cruz in a blog post. Google had been testing new code designed to keep data geographically closer to its owner, which brought about disruption when maintenance in one data center caused another facility to be overloaded. This had a cascade effect, according to Google, and it took the company an hour to get it back under control."