Re: [Qemu-devel] [RFC PATCH 0/2] Migration: support working on file:url

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Daniel P. Berrange (berrange@redhat.com) wrote:
> On Thu, Jul 21, 2016 at 01:05:58PM +0800, zhanghailiang wrote:
> > It is more simple to use file:url to migrate VM into file.
> > Besides, it will be used in memory snapshot.
> 
> NB, you can already migrate into a file
> 
>    "exec:/bin/cat > /path/to/file"
> 
> and likewise
> 
>   qemu -incoming "exec:/bin/cat /path/to/file"
> 
> This avoids the problem with POSIX I/O on plain files not actually
> supporting O_NONBLOCK in any sensible manner, which your file:
> suggestion suffers from.

Hmm that's a shame; I liked this idea as a nice simplification of the
exec: stuff.

Dave

> Regards,
> Daniel
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Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK