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Using VIR_STORAGE_VOL_WIPE_ALG_TRIM a RBD volume can be trimmed down to 0 bytes using rbd_discard() Effectively all the data on the volume will be lost/gone, but the volume remains available for use afterwards. Starting at offset 0 the storage pool will call rbd_discard() in stripe size * count increments which is usually 4MB. Stripe size being 4MB and count 1. rbd_discard() is available since Ceph version Dumpling (0.67) which dates back to August 2013. 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>