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DRBD (Distributed Replicated Block Device) is a distributed storage system for theGNU/Linux platform. It consists of a kernel module, several userspace management applications and some shell scripts and is normally used on high availability (HA) clusters. DRBD bears similarities to RAID 1, except that it runs over a network.

DRBD refers to both the software (kernel module and associated userspace tools), and also to specific logical block devices managed by the software. DRBD device and DRBD block device are also often used for the latter.

It is free software released under the terms of the GNU General Public License version 2.

Ref: http://en.wikipedia.org/wiki/DRBD

Tips on how to set up a “heartbeat” system in Linux: http://www.associatedcontent.com/article/1930488/installing_and_configuring_heartbeat.html?cat=15