diff options
Diffstat (limited to 'qemu-img.texi')
| -rw-r--r-- | qemu-img.texi | 46 |
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. |