Hi, All I followed the steps in Fedora7VirtQuickStart to install Xen on Fedora 7. I downloaded couples of file system image from http://jailtime.org/. However, every time I tried to create guest OS using those file system image, I got error messages: VFS: Cannot open root device "sda1" or unknown-block(0,0) Please append a correct "root=" boot option Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) An example of Xen configure is: kernel = "/boot/vmlinuz-2.6.20-2936.fc7xen" memory = 256 name = "fedora.fc6" vif = [ '' ] dhcp = "dhcp" disk = ['file:/xen/fedora/fedora.fc6.img,sda1,w', 'file:/xen/fedora/fedora.swap, sda2,w'] root = "/dev/sda1 ro" Having been googling on this topic for a while, but still not getting the right answer for it. Any help will be appreciated. Thanks Haifeng -- Fedora-xen mailing list Fedora-xen@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-xen