DRBD® stands for Distributed Replicated Block Device and is used to implement high available Linux systems. A block device (e.g. a hard disk partition) is mirrored in real time from one productive server to one or more standby servers. DRBD can also be considered as RAID 1 over the network. DRBD is widely used as a High Availability and Disaster Recovery replication technology. LINBIT® develops and maintains DRBD under GPL as Open Source software.