Abstract: Migration of a virtual machine from a source host computing system to a target host computing system in a context in which a centralized portion of virtual machine state is maintained in a storage that is accessible to both the source host computing system and the target host computing system, and a localized portion of the virtual machine state is maintained in local storage of the source host computing system. For instance, the centralized portion of the virtual machine state might be user data, and the localized portion might be backing files for the virtual machine. In order to support the potential migration, at least a portion of the localized portion of the virtual machine state are backed up to a storage that is accessible to both the source and target host computing systems.

Abstract: Migration of a pool of virtual machines to a target physical machine. The virtual machines were all provisioned into an initial state using a master image. Thereafter, changes to the state were reflected in corresponding user delta collections for each of the virtual machines. In preparation for the migration to the target physical machine, a pool is allocated on the target machine. The target pool is associated with the same master image as the source pool. The virtual machines are provisioned within the target pool based on the master image. The virtual machines in the target pool are then connected to the corresponding user delta collection, allowing the virtual machines to continue in the same state in the target machine as when they operated in while last operating in the source machine. The target machine may be as master service provider.

Abstract: Migration of a virtual machine from a source host computing system to a target host computing system in a context in which a centralized portion of virtual machine state is maintained in a storage that is accessible to both the source host computing system and the target host computing system, and a localized portion of the virtual machine state is maintained in local storage of the source host computing system. For instance, the centralized portion of the virtual machine state might be user data, and the localized portion might be backing files for the virtual machine. In order to support the potential migration, at least a portion of the localized portion of the virtual machine state are backed up to a storage that is accessible to both the source and target host computing systems.

Abstract: Migration of a pool of virtual machines to a target physical machine. The virtual machines were all provisioned into an initial state using a master image. Thereafter, changes to the state were reflected in corresponding user delta collections for each of the virtual machines. In preparation for the migration to the target physical machine, a pool is allocated on the target machine. The target pool is associated with the same master image as the source pool. The virtual machines are provisioned within the target pool based on the master image. The virtual machines in the target pool are then connected to the corresponding user delta collection, allowing the virtual machines to continue in the same state in the target machine as when they operated in while last operating in the source machine. The target machine may be as master service provider.