High availability clustering of virtual machines ? possibilities and pitfalls

" summary

Explains how different virtualization approaches (hardware virtualization like VMware, para-virtualisation like Xen, and OS-virtualisation like OpenVZ and Linux-Vserver/User Mode Linux) affect options for high-availability clustering. Compares clustering hosts vs clustering guest VMs, shared storage vs replication (DRBD), and gives a detailed example of host OS clustering using OpenVZ with Heartbeat and DRBD, plus discussion of advantages, drawbacks and common pitfalls.

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