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DRBD - High availability network disk replication
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The Gist
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DRBD refers to block devices designed as a building block to form high
availability (HA) clusters. This is done by mirroring a whole block device via
an assigned network. DRBD can be understood as network based raid-1.

http://drbd.org

Highlights
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+ Open source
+ Synchronously replicate storage over the network using commodity hardware