HP Array Controller HSG V8.7 Software - Manual (Page 244)

5–48 HSG80 User’s 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 maintenance 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 “Disabling and Enabling the External Cache
Batteries,” page 5–48, to prevent the write-back cache batteries from
discharging.
Disabling and Enabling the External Cache Batteries
Use the following steps to disable the ECBs:
Note The ECB SBB may contain one or two batteries, depending on
the configuration.
1. Press the battery-disable switch located on each battery within the ECB
SBB. The switch is the small button labeled SHUT OFF next to the
status LED (see Figure 5–9). Hold each switch in for approximately five
seconds. The ECB’s status LED will flash once and then shut off. Make
sure you perform this procedure on both ECB 1 and ECB 2, if
appropriate.