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Diffstat (limited to 'qemu-img.texi')
| -rw-r--r-- | qemu-img.texi | 6 |
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, |