User`s guide

7. (All controller models:) Restart both controllers by pressing the OCP reset
(//) button on each controller’s front bezel, or enter the following commands at
the CLI> prompt in the sequence given:
CLI> RESTART OTHER_CONTROLLER
CLI> RESTART THIS_CONTROLLER
8. Enter the following commands at the CLI> prompt to determine whether the
preceding parameters are set correctly (all controller models):
CLI> SHOW THIS_CONTROLLER FULL
CLI> SHOW OTHER_CONTROLLER FULL
9. Enable the host port paths for both controllers (HSJ controllers).
Enter the following commands at the CLI> prompt to enable CI Path A and
Path B to the host:
CLI> SET THIS_CONTROLLER PATH_A
CLI> SET THIS_CONTROLLER PATH_B
CLI> SET OTHER_CONTROLLER PATH_A
CLI> SET OTHER_CONTROLLER PATH_B
Enter the following commands at the CLI> prompt to enable the host port
paths for HSD30 controllers:
CLI> SET THIS_CONTROLLER PATH
CLI> SET OTHER_CONTROLLER PATH
HSZ controller host port paths are always on, so no command is needed.
Note
Always restart the controller after setting the controller’s ID, the SCS
node name, or the allocation class by pressing the OCP reset (//) button on
the controller’s front bezel, or by entering the RESTART command at the
CLI> prompt.
10. HSJ and HSD30 Array Controllers: Set preferred paths to balance units
between controllers for better performance in a dual-redundant configuration.
Using preferred paths maintains unit-to-controller assignments when dual-
redundant pairs are restored from a failover condition. Use the following
command:
CLI> SET unit PREFERRED_PATH= THIS_CONTROLLER
or
CLI> SET unit PREFERRED_PATH= OTHER_CONTROLLER
Faults that are external to an HSJ or HSD30 array controller in a dual-
redundant pair (for example, when the CI path fails), do not allow for
proper failover if preferred paths are active. To correct this problem, enter
the SHUTDOWN OTHER_CONTROLLER command from the unaffected
controller, which forces failover to occur.
Note
Preferred paths apply only to disk-based units or optical disk library
units. Do not attempt to use preferred paths with tape or CD–ROM-based
units.
Controller Operations 5–13