https://status.cloud.google.com/incident/compute/15056#5719570367119360
> From Thursday 13 August 2015 to Monday 17 August 2015, errors occurred on a small proportion of Google Compute Engine persistent disks in the europe-west1-b zone
> At 09:19 PDT on Thursday 13 August 2015, four successive lightning strikes on the local utilities grid that powers our European datacenter caused a brief loss of power to storage systems
> This outage is wholly Google's responsibility