whether we already use like that ?
https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L5156

From: fdsafdsafd [mailto:[email protected]]
Sent: Thursday, July 24, 2014 4:30 PM
To: [email protected]
Subject: [openstack-dev] [nova]resize

In resize, we convert the disk and drop peel backing file, should we judge 
whether we are in shared_storage? If we are in shared storage, for example,
nfs, then we can use the image in _base to be the backing file. And the time 
cost to resize will be faster.

The processing in line 5132
https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py


Thanks

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