Blueprint changed by John Garbutt: Whiteboard changed: Once host-aggregates is complete, we can use the XenServer/XCP pool concept, along with shared storage configured as the default storage on that pool, to allow live migration of some images. Currently Amazon style three part images are loaded into Dom0's file system, so there would need to be lots of work to copy these between the hosts to ensure the VM can boot. As a first step, it is best to concentrate on images without an external kernel and ramdisk. **** An early cut of this is available, but currently depends on aggregate changes that are not in trunk, and really requires a bit of refactoring around the libvirt/xenapi differences: https://github.com/citrix-openstack/nova/commit/19e6e59ec1587906231bf995a67b5696ba800aa7 + + **** + + Here is what I plan to do next: + * Step 1: Pool-based live migration (pool/host-aggregate, requires shared storage is default SR) + * Step 2: Live migration using new cross pool migration (coming to XCP & XenServer in H2 2012) + * Step 3: Consider live-migration without explicitly specifying the destination host (like migrate) + * Step 4: Add tests into Tempest for live migration + * Step 5: (probably post Folsom) Support live migration with external ram disk and kernel
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