KVM : convert disk format to qcow2 from row image

[root@localhost ~]# uname -ri 3.7.5-201.fc18.x86_64 x86_64 [root@localhost ~]# cat /etc/fedora-release Fedora release 18 (Spherical Cow) [root@localhost ~]# qemu-kvm --version QEMU emulator version 1.2.2 (qemu-kvm-devel), Copyright (c) 2003-2008 Fabrice Bellard [root@localhost ~]# libvirtd

# qemu-img info ubuntu-1204-vm1.row image: ubuntu-1204-vm1.row file format: raw virtual size: 10G (10737418240 bytes) disk size: 10G

convert

# qemu-img convert -O qcow2 ubuntu-1204-vm1.row ubuntu-1204-vm1.qcow2

[root@localhost KVM_images]# qemu-img info ubuntu-1204-vm1.qcow2 image: ubuntu-1204-vm1.qcow2 file format: qcow2 virtual size: 10G (10737418240 bytes) disk size: 2.2G cluster_size: 65536 [root@localhost KVM_images]# qemu-img check -f qcow2 ubuntu-1204-vm1.qcow2 No errors were found on the image.

edit the VM’s xml file to use the qcow2 image instead of the row image.

# virsh edit ubuntu1204-vm1

before

<driver name='qemu' type='raw'/>       <source file='/var/run/media/hattori/fedora-HDD/KVM_images/ubuntu-1204-vm1.row'/>

after

<driver name='qemu' type='qcow2'/>       <source file='/var/run/media/hattori/fedora-HDD/KVM_images/ubuntu-1204-vm1.qcow2'/>

start the VM with qcow2.

# virsh start ubuntu1204-vm1 Domain ubuntu1204-vm1 started

virsh # qemu-monitor-command --hmp ubuntu1204-vm1 'info status' VM status: running virsh # qemu-monitor-command --hmp ubuntu1204-vm1 'info block' drive-virtio-disk0: removable=0 io-status=ok file=/var/run/media/hattori/fedora-HDD/KVM_images/ubuntu-1204-vm1.qcow2 ro=0 drv=qcow2 encrypted=0 bps=0 bps_rd=0 bps_wr=0 iops=0 iops_rd=0 iops_wr=0 drive-ide0-1-0: removable=1 locked=0 tray-open=0 io-status=ok [not inserted]