Openstack vm live migration
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Transcript of Openstack vm live migration
Openstack VM live migration
• Openstack VM live migration can have 3 categories:
• Block live migration without shared storage
• Shared storage based live migration
• Volume backed VM live migration
Block live migration
• Block live migration does not require shared storage among nova-compute nodes
• it uses network(TCP) to copy VM disk from source host to destination host,
• it takes longer time to complete than shared storage based live migration.
• it takes longer time to complete than shared storage based live migration.
Shared storage based live migration
• GlusterFS as shared storage for nova-compute nodes
• Since VM disk is stored on shared storage, hence live migration much much more faster than block live migration.
Volume backed VM live migration
• VMs booted from volume can be also easily and quickly migrated just like shared storage based live migration since both cases VM disks are on top of shared storages.