Install the agent on the new machine.
See the Sun Update Connection - Enterprise 1.0 Administration Guide.
Add this managed host to the openMosixCluster group.
See To Edit a Group.
Open the mosix.map knowledge base file and add a new node number and the IP of the new machine.
Open the /etc/hosts knowledge base files and add the new host name.
See Opening Host Files.
Run the job with the openMosixNode profile in deploy mode on the openMosixCluster group.
Legacy data and applications are not touched by the job, but the new map and hosts files are downloaded to each node. See Creating Complex Jobs.