Red Hat Bugzilla – Bug 1297255
add possibility to sparsify image during block copy
Last modified: 2018-02-27 01:51:28 EST
Fixing summary to clarify.
Description asks libvirt to add possibility to enable sparsification of the regions of the image containing only zero blocks so that they are actually unmapped.
Note that this comes with a performance penalty thus it should not be enabled by default.
Also note that qemu already keeps the unmaped regions unmapped when copying, so this is useful only when the regions were not unmapped before for some reasons.