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Re: [Qemu-devel] [PATCH 0/2] Update documentation for qemu-img + add new

From: Jamie Lokier
Subject: Re: [Qemu-devel] [PATCH 0/2] Update documentation for qemu-img + add new -B option
Date: Thu, 5 Jun 2008 13:16:54 +0100
User-agent: Mutt/1.5.13 (2006-08-11)

Marc Bevand wrote:
> On Wed, Jun 4, 2008 at 8:39 AM, Jamie Lokier <address@hidden> wrote:
> >
> >  - When using a relative image, you should be able to set the
> >    permissions on the base image to read-only.  If you have a lot of
> >    relative images, it's really important not to modify the base
> >    image, and worrying that one of your QEMU processes might write to
> >    the base image.  Virtual PC allows the base image to be read-only,
> >    and quite a lot of notes on Differencing stress how important it
> >    is to set permissions that way, if you are sharing the base.
> I have been using qemu this way for a while: hundreds of cow images
> based on a small set of read-only base images (that were also
> chattr +i to prevent accidents).

I could have sworn qemu complained when I tried to use a read-only
base image - several times.  That's the basis of the above comment.

But not now.  Strange.  Cool! :-)

-- Jamie

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