Technical data

2–5
Compaq HSZ80 Array Controller ACS Version 8.3 Maintenance and Service Guide
Shutting Down the Subsystem
Use the following steps to shut down a subsystem:
1. From a host console, stop all host activity and dismount the logical units in the
subsystem.
2. Connect a PC or terminal to the maintenance port of one of the controllers in
your subsystem.
3. Shut down the controllers. In single controller configurations, you only need to
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. Turn off the power to the subsystem.
CAUTION: If you are shutting down the controller for longer than one
day, perform the steps in the next section, “Disabling the External Cache
Batteries,” to prevent the write-back cache batteries from discharging.
Disabling the External Cache Batteries
Use the following steps to disable the External Cache Batteries (ECBs):
NOTE: The ECB SBB may contain one or two batteries, depending on the
configuration.