IBM DS3500 Installation, User's, And Maintenance Manual page 110

To turn off power to one or more storage subsystems for a planned shutdown, complete the steps in the
following procedure. To turn off power for an unplanned shutdown, see "Restoring power after an
unexpected shutdown" on page 4-17. Figure 4-1 on page 4-3 shows the locations of the power switches
on a storage subsystem.
Before you proceed, use the Storage Manager software to determine the status of the system components
and special instructions. The operating-system software might require you to perform other procedures
before you turn off the power.
1. Stop all I/O activity to each storage subsystem.
2. Determine the status of all storage subsystems and components in the configuration by completing
the following steps:
a. Check all LEDs on each component in the storage enclosures. Make sure that all the LEDs show
normal status.
b. Check all LEDs on each component in the storage subsystem. Make sure that all the LEDs show
normal status.
c. Review the status of the configuration in the Subsystem Management window by clicking the
Summary tab.
The status is either Optimal or Needs Attention.
3. Do the LEDs indicate normal operation, and is the status Optimal on all configuration components?
v Yes: Go to step 5.
v No: Go to step 4.
4. To diagnose and correct the fault, complete the following steps:
a. Run the Recovery Guru by clicking Recovery Guru in the toolbar in the Subsystem Management
window.
b. Complete the recovery procedure.
If the Recovery Guru directs you to replace a failed component, use the individual LEDs to locate
the failed component.
c. When the recovery procedure is completed, click Recheck in the Recovery Guru. This action runs
the Recovery Guru again to make sure that the problem is corrected.
d. If the problem has not been corrected, contact your IBM technical-support representative. Do not
turn off power until all problems are corrected.
5. Check the cache active LED, and make sure that it is off
If the cache active LED is lit, the cache contains data. Wait for the data to clear from cache memory
before you turn off the power.
6. Check the LEDs on the storage enclosures to make sure that all drive activity LEDs are off.
If one or more LEDs are flashing, data is being written to or from the drives. Wait for all activity
LEDs to stop flashing.
7. Turn off the ac power switch on the rear of each controller in the storage subsystem.
Note: Until the power switch on each controller is turned off, power remains turned on for both
controllers.
8. Turn off both power switches on the rear of each storage enclosure in the configuration.
9. If there are enclosures with dc power supplies in your configuration, turn off the -48V disconnect
devices after turning off the power-supply switches.
10. After you perform the necessary maintenance procedures, turn on the power, using the procedure in
"Turning on the storage subsystem" on page 4-2.
4-16
System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide