[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH] qemu-img: document qed format on qemu-img man p
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH] qemu-img: document qed format on qemu-img man page |
Date: |
Wed, 13 Jun 2012 09:19:52 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Tue, Jun 12, 2012 at 05:15:29PM +0200, Kevin Wolf wrote:
> 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 <address@hidden>
> > Signed-off-by: Stefan Hajnoczi <address@hidden>
> > ---
> > 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
> >
> > 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.
>
> 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.
Yes, that makes sense. Will send a v2.
Stefan