I've recently joined the Ganeti project http://code.google.com/p/ganeti/. It is an open-source tool for managing clusters of virtual machines. It uses Xen for the virtualization and DRBD for storage (no expensive SAN). It can migrate an instance "live" from one bit of hardware to the next. It has full support for Xen (PVM or HVM) and KVM (full or semi) [translation: linux and windows instances]. For storage it supports plain LVM volumes, plain files, or "across-the-network raid1" using DRBD [translation: can failover to another machine in case of hardware death.] It is for small clusters: 2-40 nodes with hundreds (not thousands) of instances.
It shields you from having to learn the complicated Xen/KVM/DRBD commands. "gnt-instance create" builds an instance, the right DRBD stuff for replicated storage (for live and non-live migrations), and so on. It doesn't do a lot of the "enterprise" features that others have mentioned, but it fits really well for particular use-cases, especially if you need many small clusters (say, one per office around the world). (There will be a Ganeti BoF at LISA... plug plug) Tom
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