On 17/01/08 02:45, John Summerfield wrote: > Jan Iven wrote: .. >> SL4 can then run as a domU, with some caveats (cannot mix 32/64 bit >> doms). > > I'm not sure about that. I run 64-bit Fedora 8 on Intel, and run > several 32-bit guests. Sorry - I was unclear and perhaps wrong. As stated on http://www.linuxtopia.org/online_books/centos5/centos_5_xen_virtualization/centos5_ch-virt-hw-support.html > With Red Hat Virtualization, 32-bit hosts runs only 32-bit > paravirtual guests. 64-bit hosts runs only 64-bit paravirtual guests. > And a 64-bit full virtualization host runs 32-bit, 32-bit PAE, or > 64-bit guests. A 32-bit full virtualization host runs both PAE and > non-PAE full virtualization guests. This could have changed with 5.1 - Red Hat claims on http://www.europe.redhat.com/rhel/virtualization/ that 5.1 now has > # The ability to run 32-bit para-virtualized guests on x86-64 systems running in 64-bit mode. (I guess they are talking about the dom0 here) DELL seems to agree that mixing may be problematic: http://www.dell.com/downloads/global/power/ps4q07-20070547-DeLaRosa.pdf > Note: Red Hat virtualization only fully supports > matching host/guest architectures—that > is, environments in which both the host and > guest OS are either 32-bit or 64-bit operating > systems. Running a 32-bit guest OS on a 64-bit > host OS is supported only with paravirtualization, > and running a 64-bit guest OS on a 32-bit > host OS is not supported. I guess all this together shows that "there may be issues", which is what I tried to convey.. Regards jan