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![Stefan Weil](/assets/img/avatar_default.png)
This is a new block driver written from scratch to support the VDI format in QEMU. VDI is the native format used by Innotek / SUN VirtualBox. Latest changes: * stripped down version (code for synchronous operations and experimental code removed) * don't open VDI snapshot images (with uuid_link or uuid_parent) * modified vdi_aio_cancel Signed-off-by: Stefan Weil <weil@mail.berlios.de> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Message-Id:
164 lines
5.2 KiB
Plaintext
164 lines
5.2 KiB
Plaintext
@example
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@c man begin SYNOPSIS
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usage: qemu-img command [command options]
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@c man end
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@end example
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@c man begin OPTIONS
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The following commands are supported:
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@include qemu-img-cmds.texi
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Command parameters:
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@table @var
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@item filename
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is a disk image filename
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@item base_image
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is the read-only disk image which is used as base for a copy on
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write image; the copy on write image only stores the modified data
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@item output_base_image
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forces the output image to be created as a copy on write
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image of the specified base image; @code{output_base_image} should have the same
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content as the input's base image, however the path, image format, etc may
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differ
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@item base_fmt
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is the disk image format of @var{base_image}. for more information look at @var{fmt}
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@item fmt
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is the disk image format. It is guessed automatically in most cases. The following formats are supported:
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@table @code
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@item raw
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Raw disk image format (default). This format has the advantage of
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being simple and easily exportable to all other emulators. If your
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file system supports @emph{holes} (for example in ext2 or ext3 on
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Linux or NTFS on Windows), then only the written sectors will reserve
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space. Use @code{qemu-img info} to know the real size used by the
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image or @code{ls -ls} on Unix/Linux.
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@item qcow2
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QEMU image format, the most versatile format. Use it to have smaller
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images (useful if your filesystem does not supports holes, for example
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on Windows), optional AES encryption, zlib based compression and
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support of multiple VM snapshots.
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@item qcow
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Old QEMU image format. Left for compatibility.
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@item cow
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User Mode Linux Copy On Write image format. Used to be the only growable
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image format in QEMU. It is supported only for compatibility with
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previous versions. It does not work on win32.
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@item vdi
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VirtualBox 1.1 compatible image format.
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@item vmdk
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VMware 3 and 4 compatible image format.
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@item cloop
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Linux Compressed Loop image, useful only to reuse directly compressed
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CD-ROM images present for example in the Knoppix CD-ROMs.
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@end table
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@item size
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is the disk image size in bytes. Optional suffixes @code{k} or @code{K}
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(kilobyte, 1024) @code{M} (megabyte, 1024k) and @code{G} (gigabyte, 1024M)
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and T (terabyte, 1024G) are supported. @code{b} is ignored.
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@item output_filename
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is the destination disk image filename
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@item output_fmt
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is the destination format
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@item options
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is a comma separated list of format specific options in a
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name=value format. Use @code{-o ?} for an overview of the options supported
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by the used format
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@item -c
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indicates that target image must be compressed (qcow format only)
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@item -h
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with or without a command shows help and lists the supported formats
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@end table
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Parameters to snapshot subcommand:
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@table @option
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@item snapshot
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is the name of the snapshot to create, apply or delete
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@item -a
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applies a snapshot (revert disk to saved state)
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@item -c
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creates a snapshot
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@item -d
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deletes a snapshot
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@item -l
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lists all snapshots in the given image
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@end table
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Command description:
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@table @option
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@item create [-F @var{base_fmt}] [-b @var{base_image}] [-f @var{fmt}] [-o @var{options}] @var{filename} [@var{size}]
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Create the new disk image @var{filename} of size @var{size} and format
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@var{fmt}.
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If @var{base_image} is specified, then the image will record only the
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differences from @var{base_image}. No size needs to be specified in
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this case. @var{base_image} will never be modified unless you use the
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@code{commit} monitor command.
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The size can also be specified using the @var{size} option with @code{-o},
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it doesn't need to be specified separately in this case.
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@item commit [-f @var{fmt}] @var{filename}
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Commit the changes recorded in @var{filename} in its base image.
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@item convert [-c] [-f @var{fmt}] [-O @var{output_fmt}] [-o @var{options}] [-B @var{output_base_image}] @var{filename} [@var{filename2} [...]] @var{output_filename}
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Convert the disk image @var{filename} to disk image @var{output_filename}
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using format @var{output_fmt}. It can be optionally compressed (@code{-c}
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option) or use any format specific options like encryption (@code{-o} option).
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Only the formats @code{qcow} and @code{qcow2} support encryption or compression. The
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compression is read-only. It means that if a compressed sector is
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rewritten, then it is rewritten as uncompressed data.
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Encryption uses the AES format which is very secure (128 bit keys). Use
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a long password (16 characters) to get maximum protection.
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Image conversion is also useful to get smaller image when using a
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growable format such as @code{qcow} or @code{cow}: the empty sectors
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are detected and suppressed from the destination image.
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@item info [-f @var{fmt}] @var{filename}
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Give information about the disk image @var{filename}. Use it in
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particular to know the size reserved on disk which can be different
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from the displayed size. If VM snapshots are stored in the disk image,
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they are displayed too.
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@item snapshot [-l | -a @var{snapshot} | -c @var{snapshot} | -d @var{snapshot} ] @var{filename}
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List, apply, create or delete snapshots in image @var{filename}.
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@end table
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@c man end
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@ignore
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@setfilename qemu-img
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@settitle QEMU disk image utility
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@c man begin SEEALSO
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The HTML documentation of QEMU for more precise information and Linux
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user mode emulator invocation.
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@c man end
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@c man begin AUTHOR
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Fabrice Bellard
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@c man end
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@end ignore
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