Re: [libvirt] [PATCH v2] ZFS: Support sparse volumes

Richard Laager wrote:

By default, `zfs create -V ...` reserves space for the entire volsize, plus some extra (which attempts to account for overhead).

If `zfs create -s -V ...` is used instead, zvols are (fully) sparse.

A middle ground (partial allocation) can be achieved with `zfs create -s -o refreservation=... -V ...`. Both libvirt and ZFS support this approach, so the ZFS storage backend should support it.

Signed-off-by: Richard Laager <rlaager@wiktel.com> ---

Notes: This version does not clamp allocation to capacity.

src/storage/storage_backend_zfs.c | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-)

ACK and pushed, thanks! Roman Bogorodskiy