Improved Live Migration
Windows Server 2012 R2 takes full advantage of your hardware to reduce the time required to live migrate virtual machines. It is now faster and easier to manage and maintain and your private cloud infrastructure. When maintenance or upgrades are required on your server running Hyper-V, live migration enables you to quickly migrate your virtual machines. This reduces the time it takes to monitor lengthy migration operations.You can also quickly and efficiently balance your virtual machine workloads.
In Windows Server 2012 R2, live migration provides three options to reduce the time required to live migrate your virtual machines. You can choose to use memory compression. Alternatively, you can choose to use Remote Direct Memory Access (RDMA) functionality (which requires RDMA-enabled adapters) or multichannel network adapters.
These live migration options can support your private cloud infrastructure by.
Increasing the efficiency of live migration when your hardware resources are constrained (memory compression).
Increasing the scalability of live migration when your hardware resources are not constrained (multi-channel and RDMA-enabled network adapters).
Faster Live Migration (less than 10 GB)
In environments where hardware and networking resources are constrained, live migration delivers performance improvements for migrating virtual machines by compressing the memory data before sending it across the network. This utilizes spare CPU capacity available in the server running Hyper-V. Hyper-V closely monitors the CPU requirements of the virtual machine and only consumes an appropriate amount of CPU resources to quickly move virtual machines from one server to the next