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| author | Pavel Butsykin <pbutsykin@virtuozzo.com> | 2017-09-18 15:42:27 +0300 |
|---|---|---|
| committer | Max Reitz <mreitz@redhat.com> | 2017-09-26 15:00:32 +0200 |
| commit | 4ffca8904a350460cdaa6304ea8c9b9c693d2d91 (patch) | |
| tree | 3d7c0d764d18334222c11e84dc8a081361ada1b6 /qemu-img.texi | |
| parent | 69ff158b677df0862b2f2639740c8fda5eb91599 (diff) | |
| download | qemu-4ffca8904a350460cdaa6304ea8c9b9c693d2d91.tar.gz | |
qemu-img: add --shrink flag for resize
The flag is additional precaution against data loss. Perhaps in the future the
operation shrink without this flag will be blocked for all formats, but for now
we need to maintain compatibility with raw.
Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20170918124230.8152-2-pbutsykin@virtuozzo.com
[mreitz: Added a missing space to a warning]
Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'qemu-img.texi')
| -rw-r--r-- | qemu-img.texi | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/qemu-img.texi b/qemu-img.texi index 90c7eab4a8..ee5c5940d3 100644 --- a/qemu-img.texi +++ b/qemu-img.texi @@ -545,7 +545,7 @@ qemu-img rebase -b base.img diff.qcow2 At this point, @code{modified.img} can be discarded, since @code{base.img + diff.qcow2} contains the same information. -@item resize [--preallocation=@var{prealloc}] @var{filename} [+ | -]@var{size} +@item resize [--shrink] [--preallocation=@var{prealloc}] @var{filename} [+ | -]@var{size} Change the disk image as if it had been created with @var{size}. @@ -553,6 +553,10 @@ Before using this command to shrink a disk image, you MUST use file system and partitioning tools inside the VM to reduce allocated file systems and partition sizes accordingly. Failure to do so will result in data loss! +When shrinking images, the @code{--shrink} option must be given. This informs +qemu-img that the user acknowledges all loss of data beyond the truncated +image's end. + After using this command to grow a disk image, you must use file system and partitioning tools inside the VM to actually begin using the new space on the device. |