Am 12.06.2012 17:05, schrieb 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 <m...@tls.msk.ru> > Signed-off-by: Stefan Hajnoczi <stefa...@linux.vnet.ibm.com> > --- > When the qcow2 QED mode is merged we can update this again to reflect good > cache=writethrough performance in qcow2v3 /w QED mode. > > qemu-img.texi | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) > > diff --git a/qemu-img.texi b/qemu-img.texi > index 6fc3c28..78640a9 100644 > --- a/qemu-img.texi > +++ b/qemu-img.texi > @@ -232,6 +232,28 @@ 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.
Can we restrict this clearly to cache=writethrough only and possibly add a few words about QED's future? It's good to have the option today for the few people that actually need cache=writethrough, but I don't want more people than necessary to use it only to notice after a while that there's no more active development of QED and they have to do a painful conversion of all their images. Kevin
