IBM DS3500 Installation, User's, And Maintenance Manual page 115

4. Turn off power to other supporting devices (for example, management
stations).
Note: You do not have to perform this step if you are servicing only the
storage subsystem.
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 98.
Figure 75 on page 84 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. Ensure that
all the LEDs show normal status.
b. Check all LEDs on each component in the storage subsystem. Ensure 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 ensure 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 ensure 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.
Chapter 4. Operating the storage subsystem and storage enclosure
97