We've had a few teething problems with out Xen based server system. We kept running into an issue where the server "pauses" for an indefinite period of time then resumes as if nothing had happened. As the system never actually crashed, there was no information in any of the logs.
Upgrading the Xen version did not fix the problem. So, we've simplified things a bit. This allows us to get a server up and providing services.
We no longer use Xen for virtualisation (though we may use it in a VM in the future). We now use KVM / Qemu. The plan is to have one VM as the main (live) system. This is backed up using LVM snapshots. The main VM "talks" to the host system holding all of the data.
Eventually further VMs will be created including Dev (testing, etc) and *possibly* a VM running Xen. Why? Well, it allows us to create more VMs in a controlled environment for users, etc.
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