It depends on your setup. What is the OS for your grid nodes? Are you using shared binaries and SAS config?
For Linux grid:
If you have both shared binaries (SAS & LSF) and shared config then follow these steps.
(note: I'm typing this from memory, so verify I haven't missed a step)
Mount the shared drives for the binaries (SAS & LSF) and the configs (SAS & LSF)
Mount all data drives
Run the LSF Command 'hostsetup'
Run 'lsadmin reconfig' - Answer Yes to reconfigure all servers
Run 'badmin reconfig' - Answer Yes to reconfigure all servers
If you have load balanced the Workspace Server, then add the new server
Restart all object spawners when you have an outage time to pickup the changes for the load balancing
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