[one-users] copy-on-write for better performance in OpenStack?

[xeoshow]

Hello, dear all

I found OpenNebula is really a  great product, but there is still just one
feature not sure if already in OpenNebula.

As in this link:
http://www.openstack.org/projects/compute/
Features of OpenStack Compute - Bexar Release

   - ......
   - Database versioning and migration support, for painless migration from
   one version to another.
   - Instances now use copy-on-write by default for better performance.
   - Support for availability zones, through the introduction of a new
   scheduler: ZoneScheduler.


I think the COW can greatly enhance the instances provisioning performance,
is it correct? Thanks a lot.
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