This weekend, at approximately 12:00 UTC on Sunday, an issue on one of the hypervisors went by unnoticed for too long, and was finally resolved in the morning of Monday. This post explains what happened, why it happened, and what we’re going to be doing to address the situation.
Posts Tagged ‘Incident Report’
Incident Report: Backend Down
Earlier this morning, at 04:38 UTC, one out of the twenty-two IMAP backends in production stopped serving its mail spool, showing Input/Output errors on its disk. Our Standard Operating Procedure is to examine log files, flush vm caches, stop the virtual machine, and start it back up again. This occurred at 05:48 UTC. The IMAP backend in question did not come back up cleanly.
