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Documentation: Add options to image format descriptions

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Explain the existing format specific options that can be used with qemu-img
create/convert -o ...

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Kevin Wolf 2009-10-28 12:49:17 +01:00 committed by Anthony Liguori
parent 8063d0fe3b
commit 3e03236438
1 changed files with 45 additions and 1 deletions
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46
qemu-img.texi
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@ -31,7 +31,7 @@ is the destination disk image filename
@item options
is a comma separated list of format specific options in a
name=value format. Use @code{-o ?} for an overview of the options supported
by the used format
by the used format or see the format descriptions below for details.
@item -c
@ -132,10 +132,42 @@ images (useful if your filesystem does not supports holes, for example
on Windows), optional AES encryption, zlib based compression and
support of multiple VM snapshots.
Supported options:
@table @code
@item backing_file
File name of a base image (see @option{create} subcommand)
@item backing_fmt
Image format of the base image
@item encryption
If this option is set to @code{on}, the image is encrypted.
Encryption uses the AES format which is very secure (128 bit keys). Use
a long password (16 characters) to get maximum protection.
@item cluster_size
Changes the qcow2 cluster size (must be between 512 and 2M). Smaller cluster
sizes can improve the image file size whereas larger cluster sizes generally
provide better performance.
@item preallocation
Preallocation mode (allowed values: off, metadata). An image with preallocated
metadata is initially larger but can improve performance when the image needs
to grow.
@end table
@item qcow
Old QEMU image format. Left for compatibility.
Supported options:
@table @code
@item backing_file
File name of a base image (see @option{create} subcommand)
@item encryption
If this option is set to @code{on}, the image is encrypted.
@end table
@item cow
User Mode Linux Copy On Write image format. Used to be the only growable
image format in QEMU. It is supported only for compatibility with
@ -144,6 +176,18 @@ previous versions. It does not work on win32.
VirtualBox 1.1 compatible image format.
@item vmdk
VMware 3 and 4 compatible image format.
Supported options:
@table @code
@item backing_fmt
Image format of the base image
@item compat6
Create a VMDK version 6 image (instead of version 4)
@end table
@item vpc
VirtualPC compatible image format (VHD).
@item cloop
Linux Compressed Loop image, useful only to reuse directly compressed
CD-ROM images present for example in the Knoppix CD-ROMs.