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added a hint on DRBD 8 which comes with OpenVZ 2.6.18 (added a link to a thread in the forum)
This article shows how to setup a OpenVZ high availability (HA) cluster using the data replication software DRBD and the cluster manager Heartbeat. In this example the two machines building the cluster run on CentOS 4.3. The article also shows how to do kernel updates in the cluster, including necessary steps like recompiling of new DRBD userspace tools. For this purpose, kernel 2.6.8-022stab078.10 (containing DRBD module 0.7.17) is used as initial kernel version, and kernel 2.6.8-022stab078.14 (containing DRBD module 0.7.20) as updated kernel version.
<b>Update:</b> this howto currently does not describe details on OpenVZ Kernel 2.6.18, which contains DRBD version 8.*. Meanwhile, some hints on using OpenVZ Kernel 2.6.18 with DRBD 8 can be found in [http://forum.openvz.org/index.php?t=msg&th=3213&start=0& this thread in the forum].
Additional information about clustering of virtual machines can be found in the following paper: http://www.linuxtag.org/2006/fileadmin/linuxtag/dvd/12080-paper.pdf
