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From: lirans@il.ibm.com
Date: Mon,  7 Sep 2009 12:24:00 +0300
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Subject: [Qemu-devel] [PATCH 0/3] Live migration without shared storage
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To: qemu-devel@nongnu.org

This series adds support for live migration without shared storage, means 
copy the storage while migrating. It was tested with KVM. Supports 2 ways 
to replicate the storage during migration:
 1. Complete copy of storage to destination 
 2. Assuming the storage is cow based, copy only the allocated 
    data, time of the migration will be linear with the amount of allocated 
    data (user responsibility to verify that the same backend file reside 
    on src and destination).

Live migration will work as follows:
(qemu) migrate -d tcp:0:4444 # for ordinary live migration
(qemu) migrate -d blk tcp:0:4444 # for live migration with complete storage copy
(qemu) migrate -d blk inc tcp:0:4444 # for live migration with incremental storage copy, storage is cow based.

The patches are against git://git.kernel.org/pub/scm/virt/kvm/qemu-kvm.git 
kvm-87