Virtualization: Storage Live Migration

Why do we need Storage Live Migration?

VMware Storage VMotion has set the standard for storage live migration, and we need to support this feature both in RHEL/KVM and RHEV. It is not just a checkbox, but a major feature that KVM needs to support. Storage Live Migration will be used in data-center virtualization, significantly enhancing capital and operational efficiency.

How does it work?
Storage Live Migration enables live migration of virtual machine disk files across storage disks and arrays. This feature allows a customer to relocate virtual machine disk files between and across shared storage locations while maintaining continuous service availability and data integrity. The live block copy feature allows an image backing a
guest disk to be copied while the guest is online. The streaming feature allows the guest to start execution while the parent image reside remotely (with/without shared storage).

Where is it supported?
The Storage Live Migration feature will be supported in RHEL/KVM, and libvirt will provide the necessary feature set for competing with VMware Storage VMotion. Storage Live Migration will be used by Red Hat virtualization customers as part of an end-to-end virtualization solution that is designed to enable pervasive data-center virtualization.

Please comment how important this feature is for you, for your use case.