path: root/qemu-img.texi
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authorPeter Lieven <pl@kamp.de>2013-10-24 12:07:05 +0200
committerKevin Wolf <kwolf@redhat.com>2013-11-28 10:30:52 +0100
commit11b6699af59b8684128debacfc7c44cbaa6ac53b (patch)
tree631f7f7c1a398d2868fcb3cd3c719058a0173682 /qemu-img.texi
parentc3d8688470a33feb0ea78c006b4399d50c13185e (diff)
qemu-img: add support for fully allocated images
Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'qemu-img.texi')
1 files changed, 6 insertions, 0 deletions
diff --git a/qemu-img.texi b/qemu-img.texi
index 768054e900..da36975d70 100644
--- a/qemu-img.texi
+++ b/qemu-img.texi
@@ -193,6 +193,12 @@ Image conversion is also useful to get smaller image when using a
growable format such as @code{qcow} or @code{cow}: the empty sectors
are detected and suppressed from the destination image.
+@var{sparse_size} indicates the consecutive number of bytes (defaults to 4k)
+that must contain only zeros for qemu-img to create a sparse image during
+conversion. If @var{sparse_size} is 0, the source will not be scanned for
+unallocated or zero sectors, and the destination image will always be
+fully allocated.
You can use the @var{backing_file} option to force the output image to be
created as a copy on write image of the specified base image; the
@var{backing_file} should have the same content as the input's base image,