http://wiki.centos.org/HowTos/Ha-Drbd#head-f09a1e8938850ae470afd44bdbe0ef8f9ff8fe98
http://library.linode.com/linux-ha/ip-failover-heartbeat-pacemaker-drbd-mysql-ubuntu-10.04#install_and_configure_drbd
http://www.de-maria.it/2011/01/10/playing-with-drbd-and-virtualbox/
http://en.gentoo-wiki.com/wiki/Heartbeat_and_DRBD
http://www.sgenomics.org/~jtang/blog/posts/Experimenting_with_DRBD_for_data_replication_for_backup_purposes/