Hi, all when I use virt-manager to create VM, it ended in an error.the following is my step to create VM [ENV]: RHEL6.1 x86_64 [root@localhost ~]# uname -a Linux localhost.localdomain 2.6.32-131.0.15.el6.x86_64 #1 SMP Tue May 10 15:42:40 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux [root@localhost ~]# rpm -qa libvirt libvirt-0.8.7-18.el6.x86_64 [root@localhost ~]# rpm -qa qemu-kvm qemu-kvm-0.12.1.2-2.160.el6.x86_64 I have two disk: /dev/sda : 8589MB /dev/sdb : 4294 MB 1. I created one "disk:Physical Disk Device" storage pool on /dev/sdb with the name "disk2" 2. created 4GB storage volume "sdb1" on "disk2" 3. create a new VM on storage volume "sdb1" and ended in the following error Unable to complete install:'Capacity must be a positive number'