DRBD (Distributed Redundant Block Device) is a distributed storage subsystem for the Linux platform. DRBD is commonly used as a network based RAID 1 (mirroring) solution as part of a High Availability (HA) cluster, however it also provides support for active-active configurations when used with cluster aware filesystems such as GFS and OCFS2. DRBD enables businesses to accomplish their High Availability or Disaster Recovery goals with a significantly greater level of flexibility than proprietary alternatives.