The patch modified KVM (the user space portion based on Qemu) to include
a disk delta as part of the live migration. It used the same
mark-and-sweep process that is used for RAM.
This enabled the migration of read-only instances without using a hack
to serve the delta from a central location. It also greatly reduced
load on whatever was serving images (an NFS server in my old use case)
while maintaining the ability to live migrate VMs.
If I recall, the concern with including it in the SVN repo was license
related -- KVM is GPL if I'm not mistaken.
Let me know if this isn't the information you were looking for.
- Michael
On 12/12/2010 1:57 PM, Michael Stroucken wrote:
Mike, can you provide details of the patch to KVM permitting the use of
migrate=True ?
Thanks,
Michael.
