Signed-off-by: Peter Lieven <p...@kamp.de>
---
qemu-img.texi | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/qemu-img.texi b/qemu-img.texi
index 72dabd6..fcc4c1d 100644
--- a/qemu-img.texi
+++ b/qemu-img.texi
@@ -676,6 +676,26 @@ file which is COW and has data blocks already, it couldn't
be changed to NOCOW
by setting @code{nocow=on}. One can issue @code{lsattr filename} to check if
the NOCOW flag is set or not (Capital 'C' is NOCOW flag).
+@item compress.format
+Defines which compression algorithm is should be used for compressed clusters.
+The following options are available if support for the respective libraries
+has been enabled at compile time:
+
+ zlib Uses standard zlib compression
+
+The compression algorithm can only be defined at image create time and cannot
+be changed later.
+
+Note: defining a compression format will result in the compression format
+ extension being written to the Qcow2 image. Versions of QEMU before 2.10
+ will not be able to open images with this extension.
+
+@item compress.level
+Valid for compress.format=zlib defines the compression level to use for
+selected compression format. The default of @code{compress.level=0} will use
+the default compression level for the format. Alternate values range from 1 for
+fastest compression to 9 for the best compression.
+
@end table
@item Other
--
1.9.1
