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Processed in 0.174125 secs); 14 Jul 2017 09:57:20 -0000 Received: from smtp.kamp.de (HELO submission.kamp.de) ([195.62.97.28]) by mx01.kamp.de with ESMTPS (DHE-RSA-AES256-GCM-SHA384 encrypted); 14 Jul 2017 09:57:19 -0000 X-GL_Whitelist: yes Received: (qmail 21458 invoked from network); 14 Jul 2017 09:57:00 -0000 Received: from lieven-pc.kamp-intra.net (HELO lieven-pc) (relay@kamp.de@::ffff:172.21.12.60) by submission.kamp.de with ESMTPS (DHE-RSA-AES256-GCM-SHA384 encrypted) ESMTPA; 14 Jul 2017 09:57:00 -0000 Received: by lieven-pc (Postfix, from userid 1000) id 7EB51203CE; Fri, 14 Jul 2017 11:57:00 +0200 (CEST) From: Peter Lieven To: qemu-block@nongnu.org Date: Fri, 14 Jul 2017 11:56:40 +0200 Message-Id: <1500026205-15542-5-git-send-email-pl@kamp.de> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1500026205-15542-1-git-send-email-pl@kamp.de> References: <1500026205-15542-1-git-send-email-pl@kamp.de> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2a02:248:0:51::16 Subject: [Qemu-devel] [PATCH V3 4/9] qemu-img: add documentation for compress settings X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, Peter Lieven , qemu-devel@nongnu.org, mreitz@redhat.com, den@openvz.org, lersek@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Peter Lieven --- qemu-img.texi | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/qemu-img.texi b/qemu-img.texi index f11f603..79b0182 100644 --- a/qemu-img.texi +++ b/qemu-img.texi @@ -669,6 +669,26 @@ 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