SAS_UTIL_HELP.HLB  —  SHOW  CONTROLLER  Parameters
 device_name: (OPTIONAL)

    The device name is an SAS device name used to display information
    about a specific controller. The device name has the format ddcu,
    where:

    dd       is the device code.
    c        is the controller designation A through Z.
    u        is the unit number (0 through 9999).

    If you do not specify a device name, all controllers are
    displayed.
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