At approximately 17:33 EST on February 14, 2017, the Atlanta datacenter experienced a brief utility power sag from Georgia Power. The issue was identified by our colocation provider’s building monitoring system and their on-site staff began investigating immediately. They discovered that one of the UPS modules failed to operate correctly.
The UPS module in question failed to carry its portion of the shared load during this event causing the remaining modules to pickup the additional load. The other modules could not maintain proper output voltage resulting in a brief loss of critical power to our deployment.
Our colocation provider performed an on-site inspection of the UPS system and was unable to determine the root cause. Our colocation provider has tested the UPS system and now has all UPS modules back in service. All systems have been operating as intended since the incident. Additionally the UPS system successfully delivered uninterrupted power during a recent power sag.
Once the power was restored, Linode engineers worked to make all affected systems operational again. We were able to recover every system.
We do not anticipate any further issues with the Atlanta facility at this time. However since this is the second outage we've experienced in a short time frame, we are working closely with our Atlanta colocation provider to review their UPS maintenance plans as well as the recent UPS maintenance logs.
Thank you for your patience. We are sorry for the outage and the inconvenience it caused.