Drbd is a block device which is designed to build high availability clusters by providing a virtual shared device which keeps disks in nodes synchronised using tcp/ip. this simulates raid 1 but avoiding the use of uncommon hardware (shared scsi buses or fibre channel). it is currently limited to fail-over ha clusters.

this package contains the programs that will control the drbd kernel module provided in drbd-source. you will need a clustering service (such as heartbeat) to fully implement it.

homepage: http://www.drbd.org