Microsoft System Center Virtual Machine Manager 2008 R2 includes a host of new features including live migration, clustered shared volumes, and rapid provisioning. Another one of these new features is its new maintenance mode, which is designed to ease the process of performing maintenance activities on the Hyper-V host.
Maintenance mode takes advantage of another new R2 feature, live migration. When using multiple Hyper-V hosts, live migration allows you to migrate a virtual machine from one host to another with no service interruption to the user. When you enter maintenance mode, the following things will happen:
- All hosts that are capable of live migration will give you the option of migrating to another Hyper-V host or being put into a saved state
- All hosts not capable of live migration will be put into a saved state
- Virtual machine creation is blocked at the host
With these tasks automated, you can focus on quickly performing maintenance tasks to your Hyper-V host. Keep in mind that exiting maintenance mode will not automatically migrate virtual machines back, as this is still a manual process to be done at the administrators’ discretion.