Apple Xsan 1.4 - Manual (Page 122)

122 Chapter 5 Managing Metadata Controllers
Adding a Controller
You can add one or more standby controllers to a SAN so that volumes are still
available if the primary controller fails.
Any computer set to act as a controller can also function as a client. So, if you don’t
want to dedicate a computer to act solely as a standby controller, you can use an
existing client.
To add a controller:
1 If you haven’t already, connect the new controller computer to the SAN’s Fibre Channel
and Ethernet networks and install the Xsan software.