[libvirt] [PATCH V4] implement offline migration
Eric Blake
eblake at redhat.com
Wed Sep 5 17:08:33 UTC 2012
On 09/05/2012 02:48 AM, Daniel P. Berrange wrote:
>>>
>>> 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:
I agree that the existing patches are making too many assumptions and
not honoring flags correctly; but I'm still not sure why the user must
decompose offline migration into a sequence of calls...
>>>
>>> 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
...when a single virMigrate API could do the same decomposition as
syntactic sugar, if the patch were cleaned up to actually obey flags.
That is, why must virMigrate be a live-only operation, forcing
virt-manager and all other wrappers to re-implement the same giant
sequence of API calls for offline migration?
--
Eric Blake eblake at redhat.com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 617 bytes
Desc: OpenPGP digital signature
URL: <http://listman.redhat.com/archives/libvir-list/attachments/20120905/9a9ea64d/attachment-0001.sig>
More information about the libvir-list
mailing list