As far as i know vm migration is the functionality provided by hypervisors, so what exactly is the role played by openstack in the process of live migration? Does it just provide a secure way for transferring the information from one hypervisor to another or just a UI?
OpenStack and cloud in general is more than just a hypervisor. OpenStack provides the infrastructure to move not only the VM instance (Nova), but also the underlying storage (Cinder) and the networking infrastructure (Neutron) so that the live migrated instance is a full complete instance throughout the migration and works just as if it has never been moved. Additionally, you can live migrate even if you do not have an underlying shared filesystem via block migration (along with VM migration.)
All of this is detailed in http://docs.openstack.org/grizzly/openstack-compute/admin/content//configuring-migrations.html (Configuring Migrations)
Thanks med....is it possible to migrate a VM between heterogeneous hypervisors? https://ask.openstack.org/en/question/7431/is-it-possible-to-migrate-a-vm-between-heterogeneous-hypervisors/
Asked: 2013-10-08 12:50:12 -0500
Seen: 307 times
Last updated: Nov 05 '13
