Anyone is using open-e with Xen to have a High Availability solution?

How did you configured it?

I would like to have 2 or 3 computing nodes with xen and 2 servers with open-e.
If one open-e server is down, the computing nodes are conected to the other open-e server.
If one computing nodes fails, it's VM's start on the other computing nodes.

This will probably need some NFS and nos ISCSI right?
For the Xen we already have a solution but the problem is with shared storage...

What about performance?

Best Regards