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 raid 1.
Construct a highly available Apache Web server cluster that spans multiple physical or virtual Linux servers in 5 easy steps with Linux Virtual Server and Heartbeat v2.f
www.ibm.com/developerworks/linux/library/l-linux-ha/
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