On Wed, Jul 18, 2012 at 5:01 AM, Wangpan <hzwangpan@xxxxxxxxxxxxxxxx> wrote: > But how can I get the serial info in the guest os? General documentation on persistent block device naming (just grabbed the first useful link of Google): https://wiki.archlinux.org/index.php/Persistent_block_device_naming If your guest is recent enough it will automatically show the virtio-blk device in /dev/disk/by-id. If not, you may be able to check /sys/block/vda/serial yourself. If that file is not present either your guest doesn't support virtio-blk serial: either upgrade to a newer guest OS version or use one of the other persistent naming mechanisms explained in the link above. Stefan -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list