Technical data

2–56 Replacement Procedures
1. From a host console, stop all host activity and dismount the logical units in the
subsystem.
2. Connect a maintenance PC or terminal to one of the controllers’ maintenance
port in your subsystem.
3. Shut down the controllers. In single-controller configurations, shut down “this
controller.” In dual-redundant controller configurations, shut down the “other
controller” first, then shut down “this controller” with the following commands:
SHUTDOWN OTHER_CONTROLLER
SHUTDOWN THIS_CONTROLLER
When the controllers shut down, their reset buttons and their first three LEDs are
lit continuously. This may take several minutes, depending on the amount of data
that needs to be flushed from the cache modules.
4. Remove the ESD program card cover on “this controller.”
5. Press and hold the reset button while ejecting the program card from “this
controller” by pressing the program-card eject button.
6. Press and hold the reset button while inserting the new program card; “this
controller” automatically restarts. The controller is ready to handle I/O when the
CLI is responsive.
7. Replace the ESD program card cover on “this controller.”
The controller restarts. Your subsystem is now ready for operation.
8. In a dual-redundant controller configuration, repeat steps 4 through 7 for the
“other controller.”