suggestions re. cluster configuration

Hi,

I'm wrestling with possible configurations for a 2-node, high 
availability cluster.

What I seem to be zeroing in on is:
- using Xen to provide several virtual servers on each box
- using md to raid together the disks on each server
- using DRBD to mirror the primary machine to the backup server
- using EVMS to manage partitions and such
- using SSI to provide a single interface to the world for each pair of 
virtual servers

Anybody have any experience with this kind of setup? Any suggestions, 
pointers to recipes, etc.?

Thanks much,

Miles Fidelman

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