From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:45019) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SfWfW-00026X-EP for qemu-devel@nongnu.org; Fri, 15 Jun 2012 09:34:31 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SfWfU-0004sX-1s for qemu-devel@nongnu.org; Fri, 15 Jun 2012 09:34:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40336) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SfWfT-0004rn-Q6 for qemu-devel@nongnu.org; Fri, 15 Jun 2012 09:34:27 -0400 From: Kevin Wolf Date: Fri, 15 Jun 2012 15:33:31 +0200 Message-Id: <1339767219-24297-32-git-send-email-kwolf@redhat.com> In-Reply-To: <1339767219-24297-1-git-send-email-kwolf@redhat.com> References: <1339767219-24297-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PATCH 31/39] qemu-img: document qed format on qemu-img man page List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: anthony@codemonkey.ws Cc: kwolf@redhat.com, qemu-devel@nongnu.org From: Stefan Hajnoczi 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 Signed-off-by: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- 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 +@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. -- 1.7.6.5