> I typically buy a new drive, install the newer OS to that, and set up > a vmware instance pointed at the raw disks with the old install on it, > so I can boot up the old system at the same time as the new one if > necessary. Often I get a newer/faster CPU at the same time, so the > old system still works about as well as it ever did even under > virtualization (sometimes it even gets faster). > > I'm looking forward to finding out whether Xen makes this possible in > CentOS 5 without VMware. i think i read that rhel4u5 will have xen in it as well. i can't recall where i saw it. might have been someone getting confused between u5 and rhel5...