Administrative users might want to suspend an instance if it is infrequently used or to perform system maintenance. When you suspend an instance, its VM state is stored on disk, all memory is written to disk, and the virtual machine is stopped. Suspending an instance is similar to placing a device in hibernation; memory and vCPUs become available to create other instances.
To initiate a hypervisor-level suspend operation, run the following command:
$ nova suspend
INSTANCE_NAMETo resume a suspended instance, run the following command:
$ nova resume
INSTANCE_NAME
