On 05/13/2010 11:42 PM, Kumar L Srikanth-B22348 wrote: The answer is machine- and hypervisor-dependent, but in general, libvirt itself does not place any arbitrary restrictions on the hardware limit; you can run as many parallel VMs as you can create before you run out of memory or other resources. Or, to be more precise, libvirt should not place any arbitrary restrictions; if you encounter such a restriction, please report it as a bug. For an example of a non-arbitrary restriction, libvirt 0.8.1 can only support 64k-5900 simultaneous VNC connections to VMs (because there are only that many TCP/UDP ports). Contrast this with libvirt 0.7.7, where the limit was hard-coded to 100 simultaneous VNC connections - that is, we fixed the bug by removing the hard-coded limit. -- Eric Blake eblake(a)redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org