Amazon S3 Availability Event: July 20, 2008 We wanted to provide some additional detail about the problem we experienced on Sunday, July 20th. At 8:40am PDT, error rates in all Amazon S3 datacenters began to quickly climb and our alarms went off. By 8:50am PDT, error rates were significantly elevated and very few requests were completing successfully. By 8:55am PDT, we had multiple engineers engag