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Documentation: Add options to image format descriptions 

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 @item options
is a comma separated list of format specific options in a is a comma separated list of format specific options in a
name=value format. Use @code{-o ?} for an overview of the options supported 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 @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 on Windows), optional AES encryption, zlib based compression and
support of multiple VM snapshots. 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 Encryption uses the AES format which is very secure (128 bit keys). Use
a long password (16 characters) to get maximum protection. 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 @item qcow
Old QEMU image format. Left for compatibility. 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 @item cow
User Mode Linux Copy On Write image format. Used to be the only growable 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 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. VirtualBox 1.1 compatible image format.
@item vmdk @item vmdk
VMware 3 and 4 compatible image format. 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 @item cloop
Linux Compressed Loop image, useful only to reuse directly compressed Linux Compressed Loop image, useful only to reuse directly compressed
CD-ROM images present for example in the Knoppix CD-ROMs. CD-ROM images present for example in the Knoppix CD-ROMs.