Features/KVM Live Block Migration

= KVM Live Block Migration =

Summary
Provide live block migration for KVM guests

Owner

 * Name: Cole Robinson

Current status

 * Targeted release:  Fedora 18
 * Last updated: 2012-01-24
 * Percentage of completion: 70%

Detailed Description
Provide a live block copy feature, it allows an image backing a guest disk to be copied while the guest is online. It will be used to implement storage vm motion. Streaming feature allows the guest to start execution while the parent image reside remotely (with/without shared storage)

Benefit to Fedora
Key use cases and deployment scenarios 1. Want to move the VM from low performing LUNs to high performing LUNs 2. Want to move from qcow to raw to improve performance 3. Want to free a LUN 4. Want to move a VM running on local storage to shared storage

Scope
Qemu userspace updates targeted for the 1.1 release and will be added to Fedora qemu for testing over the next week.

How To Test

 * FIXME(Test plan to be written)

User Experience
Users will be able to migrate storage for running guests opening up a myriad of system management options previously not available.

Contingency Plan
None necessary.

Release Notes
KVM users can now migrate storage for running guests without interrupting service.

Documentation
http://wiki.qemu.org/Features/LiveBlockMigration

Comments and Discussion

 * See Talk:Features/KVM Live Block Migration