Urs Rau wrote: > Thanks, I tried this, but no change. I think this was/is possibly just > related to the limit of number of loopback interfaces the standard > kernel has. And how to increase this. But for me it has no effect on the > number of DomU I can run. I only manage Dom0 + 4 after that it just > hangs on a xm create and when I hit Ctrl-c it comes back with the error > Error: Device creation failed for domain test5. Assuming you are using the xen packages that came with CentOS-5 (as opposed to downloading XenExpress which I believe has a hard limit of 4 vms), I'm at a loss here too. Also, it seems you are doing full virtualization (I'm doing para), but I don't see why that would make a difference. Although it might be interesting to see if you could create a paravirt VM. Either way, hopefully someone more knowledgeable can jump in here. johnn