Comment 3 for bug 1796981

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Matt Riedemann (mriedem) wrote :

Looks like the libvirt driver is the only driver that implements the block_stats() method, and it that method encounters an error it logs it and returns None:

https://github.com/openstack/nova/blob/6bf11e1dc14afad78b11d980c2544a3dc41579ff/nova/virt/libvirt/driver.py#L6364