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authorKevin Wolf <kwolf@redhat.com>2009-10-28 12:49:17 +0100
committerAnthony Liguori <aliguori@us.ibm.com>2009-11-09 08:43:12 -0600
commit3e03236438b5015dda8bebf9c247b978565f0211 (patch)
treeaeaf92bee572bfe61fafca607e5597bd3756f628 /qemu-img.texi
parent8063d0fe3b1a1750ed44b7543f601a1b611045ce (diff)
downloadqemu-arm-3e03236438b5015dda8bebf9c247b978565f0211.tar.gz
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>
Diffstat (limited to 'qemu-img.texi')
-rw-r--r--qemu-img.texi46
1 files changed, 45 insertions, 1 deletions
diff --git a/qemu-img.texi b/qemu-img.texi
index 2d0106b84d..ac978542c2 100644
--- a/qemu-img.texi
+++ b/qemu-img.texi
@@ -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.