[libvirt-users] libvirt, snapshots, LVM, and existing VMs
Osier Yang
jyang at redhat.com
Mon Jan 31 05:51:36 UTC 2011
于 2011年01月30日 06:18, Casey Link 写道:
>> How to create the logical pool, refer to:
>> http://libvirt.org/git/?p=libvirt.git;a=tree;f=tests/storagepoolxml2xmlin;h=92d08b31073ade34bc2112694219030130fc5bd1;hb=HEAD
>>
>> How to create the logical volume with backing store, refer to:
>> http://libvirt.org/git/?p=libvirt.git;a=tree;f=tests/storagevolxml2xmlin;h=ed26441f354c5183499eae14b56e280fe36c1da6;hb=HEAD
>
> Hi Osier,
>
> So, I have managed to setup an LVM backed pool (koth-main), and
> created volumes from this pool:
>
> vol-create-as --pool koth-main --name koth-foo-snap --capacity 2G
> vol-create-as --pool koth-main --name koth-foo --capacity 2G
> --backing-vol koth-foo-snap
>
> I then performed a virt-install, and after configuring the system
> attempted s snapshot, but as you can see it still doesn't work. I get
> the same error as before:
> snapshot-create koth-foo
> error: Requested operation is not valid: Disk '/dev/main/koth-foo'
> does not support snapshotting
Sorry for the late, qemu driver only supports domain snapshotting
when the disks' driver type is "qcow2". e.g.
<disk...>
......
<driver name="qemu" type="qcow2"/>
......
</disk>
>
> Did I miss a step?
>
> Best,
>
> Casey
>
> Below is the XML for the main volume:
>
> <volume>
> <name>koth-foo</name>
> <key>5er4qK-stqa-zzJn-Npbe-HOeH-aYfs-TULujB</key>
> <source>
> <device path='/dev/sda2'>
> <extent start='417685569536' end='419833053184'/>
> </device>
> </source>
> <capacity>2147483648</capacity>
> <allocation>2147483648</allocation>
> <target>
> <path>/dev/main/koth-foo</path>
> <permissions>
> <mode>0600</mode>
> <owner>0</owner>
> <group>6</group>
> </permissions>
> </target>
> <backingStore>
> <path>/dev/main/koth-foo-snap</path>
> <permissions>
> <mode>0660</mode>
> <owner>0</owner>
> <group>6</group>
> </permissions>
> </backingStore>
> </volume>
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