Xen users - Nov 2011 - As a virtual disk image , a qcow2 image can't be based on a qcow2 image

Hi,
Under the environment with xen 3.2 running,a virtual disk image can be a qcow
image based on a qcow image.In xen 4.1.2,I find that a qcow/qcow2 image can only
be based on a raw image . Doesn''t xen 4.1.2 support an incremental
image based on an incremental image?Or is there something wrong with my
configuration file?I want to know how to use a qcow/qcow2 image based on a
qcow/qcow2 image as a virtual disk image.
 
hxk

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