Re: [libvirt] [PATCH 01/16] Introduce yet another migration version in API.
On Wed, May 11, 2011 at 10:09:47 +0100, Daniel P. Berrange wrote:
The problems with this [migration v2] are:
- Since the first step is a generic 'DumpXML' call, we can't
add in other migration specific data. eg, we can't include
any VM lease data from lock manager plugins
- Since the first step is a generic 'DumpXML' call, we can't
emit any 'migration begin' event on the source, or have
any hook that runs right at the start of the process
- Since there is no final step on the source, if the Finish
method fails to receive all migration data & has to kill
the VM, then there's no way to resume the original VM
on the source
Sorry for not noticing it earlier but I think we have another problem with our
current migration schema (and this v3 as well). Domain XML may contain some
data (such as /domain/devices/graphics/@listen) that an application may wish
to change when migrating a domain. What would be the best way to implement the
ability to modify domain XML that is passed to target libvirtd? A callback
parameter for virDomainMigrate API or something else perhaps?
Jirka