To reboot a multiple cluster elements on a COB board, use the rms_boot command.
For example, assume several COB boards are installed in a shelf named 'everest'. To reboot every cluster element on every board in the shelf, issue the following command:
rms_boot * * everest
A cluster element warm reset takes approximately X seconds. Use the rms_ip command to retrieve the IP address of an element, then attempt a connection with telnet or ssh: if the reboot is complete, the element will respond to the connection request.