High availability on two boxes

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Hi,
I'm experimenting with a HA setup on two physical boxes. The idea is to create virtual Xen machines that automagically do live migration from one physical box to the other in case of e.g. a hardware failure on one of the physial boxes.

My idea is to create a software raid of networked block devices and real disks. I.e:

Box A:
Software raid consisting of:
Physical disk in box A
Nework block device exported from box B

Box B:
Software raid consisting of:
Physical disk in box B
Network block device exported from box A


On top of this I plan t use GFS2 and a cluster that handles the migration of the virtual machines.

Any comments on this, would this work, or would it result in deadlock? What about quorum disk? I suppose I need one? Most setup of these kind of things usually have their storage on a separate SAN, but as this is mostly for experimentation and testing purposes, I would hope that I could do without that for now.

What would be the best way to export the network block devices? I'm thinking iSCSI or GNDB?

If this doesn't  look like a good idea, are there any other way to do this.

Regards
Uno Engborg

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