Routine maintenance on Facebook's network stitching together its data centers caused Monday's collapse of its global system for more than six hours, the company said on Tuesday.
The outage was the largest that Downdetector, a web monitoring firm, said it had ever seen. It blocked access to apps for billions of users of FacebookAt a U.S. Senate hearing on Tuesday, a former employee turned whistleblower accused Facebook of putting profits before people's safety, which the company denies.
The outage knocked out tools that engineers would normally use to investigate and repair such outages, making the task even more difficult, Facebook said. However, it took the company extra time to get engineers inside to work on the servers due to the high physical and system security in place.
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