In this session we will look at best practices for administering large MongoDB deployments in the cloud. We will discuss tips and tools for capacity planning, fully scripted provisioning using chef and knife-ec2, and snapshotting your data safely, as well as using replica sets for high availability across AZs. We will cover the good, the bad and the ugly of disk performance options on EC2, as well as several filesystem tricks for wringing more performance out of your block devices. And we will talk about how to keep your mongo clusters healthy and performing well using techniques such as continuous compaction, warming up secondaries, and other scaling and tuning tips. We will also discuss how to monitor your clusters properly and minimize downtime when things go wrong.