Gluster FS Team - Looking For Feedback on Xen

The GlusterFS team is currently trying to understand more about GlusterFS deployments with  Xen. We are looking at feedback from users of the same.
We are interested in knowing the following:
1) How many servers (Real and Virtual) do you use in the deployment?
2) What versions of operating systems/distributions do you use?
3) What is the Xen version that you use?
4) What disk based file systems do you use?
5) What is the amount of storage in the deployment?
6) What is the network interconnect that you use?  (TCP/IP, Infiniband)
Any information that you can provide us on the above would be much appreciated. Also, if you could share a topology of your deployment with us, it would be great!
Please write to Vijay <vijay at gluster.com> with any information that you can share with us.
We promise that any  information that you share with us would be kept strictly confidential.
Thanks in Advance,
GlusterFS Team