libvirt users - Nov 2012 - how to make the volume's format to qcow2 when creating volume

hi,all

the following are files of pool and volume.

storage pool is based on logical(LVM) and iscsi,now I create volume
specified the format to "qcow2"

*pool.xml*
<pool type='logical'>
  <name>pool_190</name>
  <source>
 <device
path='/dev/disk/by-path/ip-192.168.0.190:3260-iscsi-iqn.2012-11.com.cloudking:server.target1-lun-1'/>
  </source>
<target>
   <path>/dev/pool_190</path>
</target>
</pool>

*volume.xml*
<?xml version="1.0" encoding="UTF-8" ?>
<volume>
     <name>volume1</name>
     <capacity unit="GB">1</capacity>
     <target>
          <format type="qcow2" />
     </target>
</volume>

*the problmes is :when  the volume created successfully,However, the
volume's format is 'raw'*

like this

image: /dev/pool_190/volume1
*file format: raw*
virtual size: 1.0G (1073741824 bytes)
disk size: 0

how to resolve this troublesome.

libvirt :0.9.8
os:ubuntu12.04

many thanks for any reply....
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On Mon, Nov 19, 2012 at 06:53:44PM +0800, zhijun liu
wrote:
> hi,all
> 
> the following are files of pool and volume.
> 
> storage pool is based on logical(LVM) and iscsi,now I create volume
> specified the format to "qcow2"
> 
> *pool.xml*
> <pool type='logical'>
>   <name>pool_190</name>
>   <source>
>  <device
>
path='/dev/disk/by-path/ip-192.168.0.190:3260-iscsi-iqn.2012-11.com.cloudking:server.target1-lun-1'/>
>   </source>
> <target>
>    <path>/dev/pool_190</path>
> </target>
> </pool>
> 
> *volume.xml*
> <?xml version="1.0" encoding="UTF-8" ?>
> <volume>
>      <name>volume1</name>
>      <capacity unit="GB">1</capacity>
>      <target>
>           <format type="qcow2" />
>      </target>
> </volume>
> 
> *the problmes is :when  the volume created successfully,However, the
> volume's format is 'raw'*
The use of non-raw formats is only supported for file based
storage volumes. You're using LVM, so its always creating it
raw.

Danel
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