Jetpants: a toolkit for huge MySQL topologies

Tumblr is one of the largest users of MySQL on the web. At present, our data set consists of over 60 billion relational rows, adding up to 21 terabytes of unique relational data. Managing over 200 dedicated database servers can be a bit of a handful, so naturally we engineered some creative solutions to help automate our common processes.

http://engineering.tumblr.com/post/24612921290/jetpants-a-toolkit-for-huge-mysql-topologies