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qemu-img: document qed format on qemu-img man page

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The qemu-img.1 man page is missing the qed format from its list of
supported formats.  Document the image creation options for qed.

Suggested-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Stefan Hajnoczi 2012-06-13 14:29:15 +01:00 committed by Kevin Wolf
parent 0446919dca
commit f085800e24
1 changed files with 23 additions and 0 deletions
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qemu-img.texi
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@ -237,6 +237,29 @@ to grow.
@end table
@item qed
Image format with support for backing files and compact image files (when your
filesystem or transport medium does not support holes). Good performance due
to less metadata than the more featureful qcow2 format, especially with
cache=writethrough or cache=directsync. Consider using qcow2 which will soon
have a similar optimization and is most actively developed.
Supported options:
@table @code
@item backing_file
File name of a base image (see @option{create} subcommand).
@item backing_fmt
Image file format of backing file (optional). Useful if the format cannot be
autodetected because it has no header, like some vhd/vpc files.
@item cluster_size
Changes the cluster size (must be power-of-2 between 4K and 64K). Smaller
cluster sizes can improve the image file size whereas larger cluster sizes
generally provide better performance.
@item table_size
Changes the number of clusters per L1/L2 table (must be power-of-2 between 1
and 16). There is normally no need to change this value but this option can be
used for performance benchmarking.
@end table
@item qcow
Old QEMU image format. Left for compatibility.