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CentOS Errata and Enhancement Advisory 2005:1130-2 CentOS 4 i386 drbd / heartbeat - Enhancement Update (Extras Only) We are pleased to add drbd (with integrated heartbeat) to the CentOS extras repository. 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.