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Re: [libvirt] [PATCH V4] implement offline migration



On Wed, Sep 05, 2012 at 08:51:05AM +0800, liguang wrote:
> 在 2012-09-04二的 12:12 +0100,Daniel P. Berrange写道:
> > On Mon, Sep 03, 2012 at 02:23:24PM +0800, liguang wrote:
> > > allow migration even domain isn't active by
> > > inserting some stubs to tunnel migration path.
> > > 
> > > Signed-off-by: liguang <lig fnst cn fujitsu com>
> > > ---
> > >  src/qemu/qemu_driver.c    |    2 +-
> > >  src/qemu/qemu_migration.c |  181
> > > +++++++++++++++++++++++++++++++++++++++++++--
> > >  src/qemu/qemu_migration.h |    3 +-
> > >  3 files changed, 178 insertions(+), 8 deletions(-)
> > 
> > I really don't like the general design of this patch, even
> > ignoring all the code bugs. I think this entire patch is
> > really just a solution in search of a problem. Offline migration
> > is already possible with existing libvirt APIs:
> > 
> >    domsrc = virDomainLookupByName(connsrc, "someguest");
> >    xml = virDomainGetXMLDesc(domsrc);
> >    domdst virDomainDefine(conndst, xml);
> > 
> 
> Um, maybe you mean offline migration is just redefinition of domain at
> target side, but what about disk images the domain used without sharing
> files between source and target, do we have to take a look at this case?

Which can also be done already

   virStorageVolDownload + virStorageVolUpload

which lets the app choose exactly which disks images they wish
to copy, rather than assuming all of them should be copied.

Daniel
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