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+drbd (Distributed Replicated Block Device)
+
+DRBD is a block device which is designed to build high availability
+clusters. This is done by mirroring a whole block device via
+(a dedicated) network. You could see it as a network RAID1. DRBD
+takes over the data, writes it to the local disk and sends it to
+the other host. On the other host, it takes it to the disk there.
+
+This package contains the userspace tools for drbd.