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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>
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@ -31,7 +31,7 @@ is the destination disk image filename
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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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by the used format or see the format descriptions below for details.
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@item -c
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@ -132,10 +132,42 @@ 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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Supported options:
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@table @code
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@item backing_file
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File name of a base image (see @option{create} subcommand)
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@item backing_fmt
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Image format of the base image
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@item encryption
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If this option is set to @code{on}, the image is encrypted.
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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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@item cluster_size
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Changes the qcow2 cluster size (must be between 512 and 2M). Smaller cluster
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sizes can improve the image file size whereas larger cluster sizes generally
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provide better performance.
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@item preallocation
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Preallocation mode (allowed values: off, metadata). An image with preallocated
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metadata is initially larger but can improve performance when the image needs
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to grow.
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@end table
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@item qcow
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Old QEMU image format. Left for compatibility.
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Supported options:
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@table @code
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@item backing_file
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File name of a base image (see @option{create} subcommand)
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@item encryption
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If this option is set to @code{on}, the image is encrypted.
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@end table
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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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@ -144,6 +176,18 @@ previous versions. It does not work on win32.
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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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Supported options:
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@table @code
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@item backing_fmt
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Image format of the base image
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@item compat6
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Create a VMDK version 6 image (instead of version 4)
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@end table
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@item vpc
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VirtualPC compatible image format (VHD).
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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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