mirror of https://gitee.com/openkylin/libvirt.git
0b15f92032
RBD supports cloning by creating a snapshot, protecting it and create a child image based on that snapshot afterwards. The RBD storage driver will try to find a snapshot with zero deltas between the current state of the original volume and the snapshot. If such a snapshot is found a clone/child image will be created using the rbd_clone2() function from librbd. rbd_clone2() is available in librbd since Ceph version Dumpling (0.67) which dates back to August 2013. It will use the same features, strip size and stripe count as the parent image. This implementation will only create a single snapshot on the parent image if never changes. This reduces the amount of snapshots created for that RBD image which benefits the performance of the Ceph cluster. During build the decision will be made to use either rbd_diff_iterate() or rbd_diff_iterate2(). The latter is faster, but only available on Ceph versions after 0.94 (Hammer). Cloning is only supported if RBD format 2 is used. All images created by libvirt are already format 2. If a RBD format 1 image is used as the original volume the backend will report a VIR_ERR_OPERATION_UNSUPPORTED error. Signed-off-by: Wido den Hollander <wido@widodh.nl> |
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| gnulib | ||
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| tools | ||
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| autobuild.sh | ||
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| config-post.h | ||
| configure.ac | ||
| libvirt-admin.pc.in | ||
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| libvirt.pc.in | ||
| libvirt.spec.in | ||
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README
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>