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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, select Recheck in the
Recovery Guru. This action reruns the Recovery Guru to ensure that the
problem has been fixed.
d. If the problem has not been fixed, contact your IBM service representative.
Do not turn off power until all problems are corrected.
6. Check the Cache Active LED, and verify that it is off.
If the Cache Active LED is on steady, the cache contains data. Wait for the
data to clear from cache memory before turning off the power.
7. Check the LEDs on the storage expansion enclosures to verify that all Drive
Active LEDs are on steady (not blinking).
If one or more LEDs are blinking, data is being written to or from the drives.
Wait for all Active LEDs to stop blinking.
8. Turn off the AC power switch on the back of each power supply in the storage
subsystem.
9. Turn off both power switches on the back of each storage expansion enclosure
in the configuration.
10. After you perform the necessary maintenance procedures, turn on the power
using the procedure in “Turning on the storage subsystem” on page 119.
Performing an emergency shutdown
Attention: Emergency situations might include fire, flood, extreme weather
conditions, or other hazardous circumstances. If a power outage or emergency
situation occurs, always turn off all power switches on all computing equipment.
This helps to safeguard your equipment from potential damage due to electrical
surges when power is restored. If the storage subsystem loses power unexpectedly,
it might be due to a hardware failure in the power system or in the midplane.
Complete the following steps to shut down the system during an emergency:
1. If you have time, stop all I/O activity to the storage subsystem by shutting down
the host or disconnecting the storage subsystem logical drives through the host.
2. Check the LEDs. Make note of any Fault LEDs that are on so you can correct
the problem when you turn on the power again.
3. Turn off all power supply switches, starting with the DS4500 Storage Subsystem
first, and followed by the storage expansion enclosures. Then, unplug the power
cables from the storage subsystem.
Restoring power after an unexpected shutdown
Use the following procedure to restore power to the storage subsystem in a
configuration after an unplanned shutdown.
Risk of severe electrical shock – Never turn on the power to any equipment if
there is evidence of fire, water, or structural damage. Doing so might cause severe
electrical shock.
1. After the emergency situation is over or power is restored, visually check the
storage subsystem for damage. Is there evidence of damage to any of the
storage subsystem components, cables, or equipment attached to the storage
subsystem?
138 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide