diff options
Diffstat (limited to 'qemu-img.texi')
| -rw-r--r-- | qemu-img.texi | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/qemu-img.texi b/qemu-img.texi index 1bba91efde..526d56a458 100644 --- a/qemu-img.texi +++ b/qemu-img.texi @@ -57,7 +57,9 @@ indicates that target image must be compressed (qcow format only) @item -h with or without a command shows help and lists the supported formats @item -p -display progress bar (convert and rebase commands only) +display progress bar (compare, convert and rebase commands only). +If the @var{-p} option is not used for a command that supports it, the +progress is reported when the process receives a @code{SIGUSR1} signal. @item -q Quiet mode - do not print any output (except errors). There's no progress bar in case both @var{-q} and @var{-p} options are used. @@ -140,7 +142,12 @@ it doesn't need to be specified separately in this case. @item commit [-f @var{fmt}] [-t @var{cache}] @var{filename} -Commit the changes recorded in @var{filename} in its base image. +Commit the changes recorded in @var{filename} in its base image or backing file. +If the backing file is smaller than the snapshot, then the backing file will be +resized to be the same size as the snapshot. If the snapshot is smaller than +the backing file, the backing file will not be truncated. If you want the +backing file to match the size of the smaller snapshot, you can safely truncate +it yourself once the commit operation successfully completes. @item compare [-f @var{fmt}] [-F @var{fmt}] [-p] [-s] [-q] @var{filename1} @var{filename2} @@ -391,11 +398,11 @@ support of multiple VM snapshots. Supported options: @table @code @item compat -Determines the qcow2 version to use. @code{compat=0.10} uses the traditional -image format that can be read by any QEMU since 0.10 (this is the default). +Determines the qcow2 version to use. @code{compat=0.10} uses the +traditional image format that can be read by any QEMU since 0.10. @code{compat=1.1} enables image format extensions that only QEMU 1.1 and -newer understand. Amongst others, this includes zero clusters, which allow -efficient copy-on-read for sparse images. +newer understand (this is the default). Amongst others, this includes zero +clusters, which allow efficient copy-on-read for sparse images. @item backing_file File name of a base image (see @option{create} subcommand) |