Hi, > than 16 GB of RAM. I believe you need 64-bit HV to see all. You may or > may not also need a 64-bit Dom0 - I don't know for sure since I'm not > lucky enough to have more than 16 GB of RAM :-( Dom0 can be 32bit (and must be in fedora7 if you want run 32bit guests and don't wait for the kernel update). With a 32bit hypervisor everything must fit into the hypervisor address space hole. With a 64bit hypervisor only the m2p table must fit into the address space hole. Thus even 32bit guests can see much more memory when running on a 64bit hypervisor. The limit is far beyond 64GB (was some odd number, 166GB IIRC), although I'd be prepared to run into bugs when crossing the 64GB border ... cheers, Gerd -- Fedora-xen mailing list Fedora-xen@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-xen