Patent ID: 9582319
Date: 2017-02-28
CPC Classifications: G06F

Claim:
1. A method for migrating a virtual machine across network separated data centers, comprising: synchronizing a first storage system associated with a first subnet with a second storage system associated with a second subnet via a storage system link; migrating a minimal state of the virtual machine executing on a first computer in the first subnet from the first computer to a second computer in the second subnet via a network link, the minimal state being an image of the virtual machine stored on the first storage system that contains only a minimum state information necessary for execution of the virtual machine; starting an execution of the virtual machine in the second computer based solely on the minimal state; terminating the storage system link; and migrating, subsequent to the terminating of the storage system link, updated pages of the virtual machine received from short term memory of the first computer subsequent to the migrating of the minimal state of the virtual machine to a memory of the second computer via the network link, the updated pages containing current state information of the virtual machine which, when merged with the minimal state, cause the virtual machine executing on the second computer to assume a latest state of execution of the virtual machine of the first computer.