Description DRBD is a shared-nothing, synchronously replicated block device. It is designed to serve as a building block for high availability clusters and in this context, is a "drop-in" replacement for shared storage. Simplistically, you could see it as a network RAID 1. Please visit http://www.drbd.org to find out more. The here included files are intended to help understand the implementation DRBD-8.3-data-packets.svg, DRBD-data-packets.svg relates some functions, and write packets. conn-states-8.dot, disk-states-8.dot, node-states-8.dot The sub graphs of DRBD's state transitions