On 01/20/2015 12:18 AM, Pádraig Brady wrote:
On 19/01/15 20:41, Michael Still wrote:

qcow2 can do a copy on write layer, although it can be disabled IIRC.
So if COW is turned on, you get only the delta in the instance
directory when using qcow2.


On Tue, Jan 20, 2015 at 7:40 AM, Dmitry Guryanov
<dgurya...@parallels.com> wrote:

Do I understand correctly, that both Qcow2 and Raw classes in
libvirt/imagebackend.py can work with images in qcow2 format, but Raw copies
the whole base image from cache to the instance's dir and Qcow2 only creates
a delta (and use base image from cache)?
Correct.  That Raw class should be renamed to Copy,
to clarify/distinguish from CopyOnWrite.

BTW there are some notes on these settings at:


Thanks! Excellent article.

Dmitry Guryanov

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