Proposed F19 Feature: Virt Storage Migration

Jaroslav Reznik jreznik at
Thu Jan 31 19:15:23 UTC 2013

= Features/Virt Storage Migration =

Feature owner(s): Cole Robinson <crobinso at>, Paolo Bonzini 
<pbonzini at>

Migrate a running virtual machine from one host to another, including in use 
storage, with no downtime. No need for a shared storage location between the 

== Detailed description ==
Live migration of a VM has been around for a while, but usage historically 
required that VM storage disk images were shared between the source and 
destination host, and mounted in the same location.

Since qemu 0.12 (December 2009), there has been a storage migration feature in 
qemu, but it was inflexible, and inefficient to the point that any workload in 
the guest would often prevent the guest from ever being full migrated. While 
supported in libvirt/virsh, it was still difficult to use, requiring stub disk 
images to be present on the destination host.

New developments in QEMU allow migrating a VM with no shared storage between 
the source and destination, and does it in a performant manner. 

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