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Is the qcow2 image format stabilize?

As all we know, the openstack image has many type format:

qcow2, raw, vmdk and so on...

Does their stability has difference?
or, all are very stabilize?

I am plan to use qcow2 to as my only image type. like bellow:

Linux: CentOS6.5.qcow2, CentOS7.2.qcow2, CentOS7.3.qcow2 Ubuntu14.01.qcow2 ......
Windows: Windows2000.qcow2, Windows2002.qcow2,Windows2008.qcow2 .......

I don't know whether this is reasonable. I am fear the .qcow2 format image is not stabilize.

Is the qcow2 image format stabilize?

As all we know, the openstack image has many type format:

qcow2, raw, vmdk and so on...

Does their stability has difference?
or, all are very stabilize?

I am plan to use qcow2 to as my only image type. like bellow:

Linux: CentOS6.5.qcow2, CentOS7.2.qcow2, CentOS7.3.qcow2 Ubuntu14.01.qcow2 ...... 
Windows: Windows2000.qcow2, Windows2002.qcow2,Windows2008.qcow2 .......

.......

I don't know whether this is reasonable. I am fear the .qcow2 format image is not stabilize.