Comment 3 for bug 1896617

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Nikolay Vinogradov (nikolay.vinogradov) wrote : Re: Creation of image (or live snapshot) from the existing VM fails if libvirt-image-backend is configured to qcow2

Possibly relevant: https://github.com/openstack/nova/commit/fafbc182f9179c16b89c45d02544d4582e0a1194#diff-f4019782d93a196a0d026479e6aa61b1R1814

In Bionic Ussuri we have libvirt 6.0.0 and qemu 4.2.0 which could potentially change the behaviour of live snapshot on the ephemeral local disks.