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Since Ceph version Infernalis (9.2.0) the new fast-diff mechanism of RBD allows for querying actual volume usage. Prior to this version there was no easy and fast way to query how much allocation a RBD volume had inside a Ceph cluster. To use the fast-diff feature it needs to be enabled per RBD image and is only supported by Ceph cluster running version Infernalis (9.2.0) or newer. Without the fast-diff feature enabled libvirt will report an allocation identical to the image capacity. This is how libvirt behaves currently. 'virsh vol-info rbd/image2' might output for example: Name: image2 Type: network Capacity: 1,00 GiB Allocation: 124,00 MiB Newly created volumes will have the fast-diff feature enabled if the backing Ceph cluster supports it. Signed-off-by: Wido den Hollander <wido@widodh.nl>
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>