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I have a lot of trouble trying to host xen 4 on my dedicated server. I first tried centos, it had only xen 3, but everything went amazingly smooth - I had win xp up & running in few minutes. However, I want to host windows server 2k8 r2 and it needs xen in a version at least 4.0.

I've tried debian and opensuse, both has xen 4 as packages, but both seems to be unstable. I don't know what exactly happens, but the server became unreachable during guest boot and every single dom0 reboot. The problem is, the panel my hoster ( has the option to do hw reset, but... it seems to stop working when it freezes. Each time that happens, I have to order a manual hw reset, and have to wait about half an hour for staff to react. It makes it completely impossible to find the issue :( the staff usually responds with something like 'it was a black screen' or 'it was frozen'. Do you guys have any ideas how I could try to "debug" it? Or maybe any good xen replacement...?

KVM is above my budget (it's more expensive than a server itself...), and dc is way too far and probably I couldn't get there anyway...

I have completely no idea what else I could try or where to look for help. I feel so useless right now...

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Contact Hetzner support? – Tom O'Connor Dec 20 '11 at 13:39
up vote 1 down vote accepted

Quick question: what's your cpu? I just had a similar issue it was with xcp where it would hang and require a manual power off. Check in your bios in the processor section and see if c-state is enabled. If so, disable it and see if it fixes your issue.

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It's intel i7 920. I'm not sure whether I am able to change something in the bios, I will have to call support I guess. – trakos Apr 19 '11 at 0:20
I would def look into this as it is on the list of processors with issues. – gdurham Apr 19 '11 at 0:27
I realized that for hosting a windows server 2k8 r2 xen 3.4 is sufficient, so I went for centOS and added unofficial gitco repositories, installed xen 3.4 and the crashes are gone, while I can boot windows server 2k8 r2 - I'm fully happy with that setup for now. – trakos Apr 20 '11 at 18:15
The proppable reason why you don`t see the blackouts any more is that xen 3.4 does not support the power-saving-functions. 4.x does - and then you will run into the C-state issue mentioned by gdurham. – Nils May 18 '11 at 19:38

Stay with xen3 unless you know exactly what xen4 gives you. You may have issues running HVM guests with Hetzner routed network setup though.

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