Hi,
We are running on CentOS 7.0. We want to move our VMs (kvm/qemu) from qcow/image files to logical volumes under LVM.
I have moved one of them but I had a little trouble editing the disk properly and I wonder what is the correct way to do it. Specifically, in the XML under the devices/disk section why does the source say "source file=", and not "source dev="? The reason I ask is that I have a number of other machines to move and I don't want to mess them up.
The source file entry for the disk was like this in our xml file: <source file='/var/lib/libvirt/images/pxetest.qcow2'/>
I got the vm to work by converting the image to raw, then dumping via dd into the LV, and editing the XML using virsh as follows:
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source file='/dev/kvm_temp/pxetest'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source file='/dev/kvm_temp/pxetest'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</disk>
By comparison I have a test machine on another real host upon which I loaded a VM and put its disk into a logical volume. Its disk section looks like this:
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none' io='native'/>
<source dev='/dev/kvm_hosts/pxetest2'/>
<target dev='hda' bus='ide'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none' io='native'/>
<source dev='/dev/kvm_hosts/pxetest2'/>
<target dev='hda' bus='ide'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
The source file / source dev thing really has me wondering.
- Mike Schwager
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