What is cold migration?
Cold migration is the process of migrating a system that has been inactivated or made inoperable for a specified period of time. This is in contrast to live migration or hot migration, where migration occurs during normal system operation.
The terms cold and warm migration are often used to refer to the migration of virtual machines in a virtualized system. With cold migration, the use of data stores is more flexible. As with any type of less dedicated migration, cold migration for virtual machines can allow more effective transfers with less complexity. However, there may be downtime as the system has to be shut down.