2011/08/15 11:56
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QEMU-IMG(1)                                                                                                                                   QEMU-IMG(1)

       qemu-img - QEMU disk image utility <-- QEMU磁盘镜像工具

       usage: qemu-img command [command options] <-- qemu-img 命令(create/info/check/convert/snapshot/commit) 命令选项(-f/-o/-c/)

       The following commands are supported: <-- 6个命令

       check [-f fmt] filename
       create [-f fmt] [-o options] filename [size]
       commit [-f fmt] filename
       convert [-c] [-f fmt] [-O output_fmt] [-o options] filename [filename2 [...]] output_filename
       info [-f fmt] filename
       snapshot [-l | -a snapshot | -c snapshot | -d snapshot] filename

       Command parameters:
       filename <-- is a disk image filename <-- 磁盘镜像文件名
       fmt <-- is the disk image format. It is guessed automatically in most cases. See below for a description of the supported disk formats. <-- 磁盘镜像格式。
       size <-- is the disk image size in bytes. Optional suffixes "k" or "K" (kilobyte, 1024) "M" (megabyte, 1024k) and "G" (gigabyte, 1024M) and T(terabyte, 1024G) are supported.  "b" is ignored. <-- 磁盘镜像文件大小。
       output_filename <-- is the destination disk image filename <-- 用在convert命令中,指转换输出的磁盘镜像文件名
       output_fmt <-- is the destination format <--  <-- 用在convert命令中,指转换输出的磁盘镜像文件格式
       options <-- is a comma(逗号) separated list of format specific options in a name=value format. Use "-o ?" for an overview of the options supported by the used format or see the format descriptions below for details.
       -c  indicates that target image must be compressed (qcow format only) <-- 如果转换输出的磁盘镜像文件格式为qcow,指示它压缩
       -h  with or without a command shows help and lists the supported formats

       Parameters to snapshot subcommand:

       snapshot <-- is the name of the snapshot to create, apply or delete <-- 快照名,不是快照文件名
       -a  applies a snapshot (revert disk to saved state)
       -c  creates a snapshot
       -d  deletes a snapshot
       -l  lists all snapshots in the given image

       Command description:
       create [-f fmt] [-o options] filename [size]
           Create the new disk image filename of size size and format fmt. Depending on the file format, you can add one or more options that enable additional features of this format. <-- 创建新的磁盘镜像文件
           If the option backing_file is specified, then the image will record only the differences from backing_file. No size needs to be specified in
           this case. backing_file will never be modified unless you use the "commit" monitor command (or qemu-img commit). <-- 用backing_file选项时不用size选项。可以用commit命令修改backing_file。
           The size can also be specified using the size option with "-o", it doesn't need to be specified separately in this case.

       commit [-f fmt] filename
           Commit the changes recorded in filename in its base image. <-- 提交修改到base image中。

       convert [-c] [-f fmt] [-O output_fmt] [-o options] filename [filename2 [...]] output_filename
           Convert the disk image filename to disk image output_filename using format output_fmt. It can be optionally compressed ("-c" option) or use any format specific options like encryption ("-o" option).
           Only the formats "qcow" and "qcow2" support compression. The compression is read-only. It means that if a compressed sector is rewritten, then it is rewritten as uncompressed data.
           Image conversion is also useful to get smaller image when using a growable format such as "qcow" or "cow": the empty sectors are detected and suppressed from the destination image.
           You can use the backing_file option to force the output image to be created as a copy on write image of the specified base image; the backing_file should have the same content as the input's base image, however the path, image format, etc may differ. <-- 你可以使用backing_file选项创建一个copy on write的镜像。

       info [-f fmt] filename
           Give information about the disk image filename. Use it in particular to know the size reserved on disk which can be different from the displayed size. If VM snapshots are stored in the disk image, they are displayed too. <-- 取磁盘镜像文件的信息。

       snapshot [-l | -a snapshot | -c snapshot | -d snapshot ] filename
           List, apply, create or delete snapshots in image filename. <-- 列表,应用,创建和删除某镜像文件上的快照

       Supported image file formats: <-- 被支持的磁盘镜像文件格式

       raw  <-- Raw disk image format (default). This format has the advantage of being simple and easily exportable to all other emulators. If your file
           system supports holes (for example in ext2 or ext3 on Linux or NTFS on Windows), then only the written sectors will reserve space. Use "qemu-img info" to know the real size used by the image or "ls -ls" on Unix/Linux.

       host_device <--
           Host device format. This format should be used instead of raw when converting to block devices or other devices where "holes" are not supported.

       qcow2 <-- QEMU image format, the most versatile format. Use it to have smaller 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. <-- QEMU磁盘镜像格式。
           Supported options:
           "backing_file" <-- File name of a base image (see create subcommand) <-- 基本镜像。
           "backing_fmt" <-- Image format of the base image
           "encryption" <-- If this option is set to "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. <-- AES加密
           "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. <-- 块大小
           "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. <-- 预申请模式

       qcow <-- Old QEMU image format. Left for compatibility.
           Supported options:
           "backing_file" <-- File name of a base image (see create subcommand)
           "encryption" <-- If this option is set to "on", the image is encrypted.

       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 previous versions. It does not work on win32.

       vdi  <-- VirtualBox 1.1 compatible image format.

       vmdk <-- VMware 3 and 4 compatible image format.
           Supported options:
           "backing_fmt" <-- Image format of the base image
           "compat6" <-- Create a VMDK version 6 image (instead of version 4)

       vpc VirtualPC compatible image format (VHD).

       cloop <-- Linux Compressed Loop image, useful only to reuse directly compressed CD-ROM images present for example in the Knoppix CD-ROMs.

       The HTML documentation of QEMU for more precise information and Linux user mode emulator invocation.

       Fabrice Bellard


                                                                        2011-06-01                                                            QEMU-IMG(1)



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