diff options
author | Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> | 2012-06-13 14:29:15 +0100 |
---|---|---|
committer | Michael Roth <mdroth@linux.vnet.ibm.com> | 2012-06-25 09:04:33 -0500 |
commit | 845685265756467050859e2359acf16321111352 (patch) | |
tree | 00a10d3109dc9e7c122aa1885a37dcdd69e910cb | |
parent | 7d440f20bda8658fe16bdfe9c41c689764c50248 (diff) |
qemu-img: document qed format on qemu-img man page
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>
(cherry picked from commit f085800e245836fed27fddb3b624a29326637657)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
-rw-r--r-- | qemu-img.texi | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/qemu-img.texi b/qemu-img.texi index 6fc3c28e0..9cee2eaa6 100644 --- a/qemu-img.texi +++ b/qemu-img.texi @@ -232,6 +232,29 @@ 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. |