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[Qemu-devel] [PATCH 31/39] qemu-img: document qed format on qemu-img man
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PATCH 31/39] qemu-img: document qed format on qemu-img man page |
Date: |
Fri, 15 Jun 2012 15:33:31 +0200 |
From: Stefan Hajnoczi <address@hidden>
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 <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
qemu-img.texi | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/qemu-img.texi b/qemu-img.texi
index 5a7b2bb..77c6d0b 100644
--- a/qemu-img.texi
+++ b/qemu-img.texi
@@ -237,6 +237,29 @@ to grow.
@end table
address@hidden 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:
address@hidden @code
address@hidden backing_file
+File name of a base image (see @option{create} subcommand).
address@hidden 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.
address@hidden 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.
address@hidden 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.
address@hidden table
@item qcow
Old QEMU image format. Left for compatibility.
--
1.7.6.5
- [Qemu-devel] [PATCH 18/39] qemu-iotests: fill streaming test image with data, (continued)
- [Qemu-devel] [PATCH 18/39] qemu-iotests: fill streaming test image with data, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 22/39] block: copy enable_write_cache in bdrv_append, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 23/39] block: add bdrv_set_enable_write_cache, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 19/39] qemu-iotests: start vms in qtest mode, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 25/39] ide: support enable/disable write cache, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 20/39] block: flush in writethrough mode after writes, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 36/39] fdc: fix implied seek while there is no media in drive, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 38/39] qemu-iotests: add qcow2.py set-feature-bit command, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 39/39] qemu-iotests: add 036 autoclear feature bit test, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 30/39] qemu-iotests: COW with many AIO requests on the same cluster, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 31/39] qemu-img: document qed format on qemu-img man page,
Kevin Wolf <=
- [Qemu-devel] [PATCH 35/39] qcow2: fix autoclear image header update, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 37/39] fdc-test: introduced qtest read_without_media, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 28/39] qcow2: Fix avail_sectors in cluster allocation code, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 24/39] block: always open drivers in writeback mode, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 33/39] xen: Don't change -drive if=xen device name during machine init, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 29/39] qemu-iotests: Some backing file COW tests, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 26/39] qcow2: always operate caches in writeback mode, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 32/39] block: Replace bdrv_get_format() by bdrv_get_format_name(), Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 34/39] xen: Don't peek behind the BlockDriverState abstraction, Kevin Wolf, 2012/06/15
- [Qemu-devel] [PATCH 27/39] qcow2: Simplify calculation for COW area at the end, Kevin Wolf, 2012/06/15