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[Qemu-devel] [PATCH 3/3] Documentation: Add options to image format desc
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PATCH 3/3] Documentation: Add options to image format descriptions |
Date: |
Wed, 28 Oct 2009 12:49:17 +0100 |
Explain the existing format specific options that can be used with qemu-img
create/convert -o ...
Signed-off-by: Kevin Wolf <address@hidden>
---
qemu-img.texi | 46 +++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 45 insertions(+), 1 deletions(-)
diff --git a/qemu-img.texi b/qemu-img.texi
index 2d0106b..ac97854 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:
address@hidden @code
address@hidden backing_file
+File name of a base image (see @option{create} subcommand)
address@hidden backing_fmt
+Image format of the base image
address@hidden 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.
+
address@hidden 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.
+
address@hidden 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.
+
address@hidden table
+
+
@item qcow
Old QEMU image format. Left for compatibility.
+
+Supported options:
address@hidden @code
address@hidden backing_file
+File name of a base image (see @option{create} subcommand)
address@hidden encryption
+If this option is set to @code{on}, the image is encrypted.
address@hidden 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:
address@hidden @code
address@hidden backing_fmt
+Image format of the base image
address@hidden compat6
+Create a VMDK version 6 image (instead of version 4)
address@hidden table
+
address@hidden 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.
--
1.6.2.5