[libvirt] [PATCH V4] implement offline migration

[liguang]

在 2012-09-05三的 08:51 +0800，liguang写道：
> 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 at 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

Yes, really not a general design, by now only
domainMigratePrepareTunnel3 support transfer data 
by stream as I see, so I choose this path to migrate disk images.

> > 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?
> 
> > This proposed patch does not offer enough (or indeed any) compelling
> > benefit over the above, to make it worth the including these hacks.
> > 
> > NACK to the entire patch.
> > 
> > Daniel.
> 

-- 
liguang    lig.fnst at cn.fujitsu.com
FNST linux kernel team