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 of the disk drive drawer 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 the DCS3700 storage system in the storage subsystem.
Note: Until the power switch on each power supply is turned off, power remains turned on for both
controllers.
8. Turn off both power switches on the rear of each storage expansion enclosure in the configuration.
9. After you perform the necessary maintenance procedures, turn on the power, using the procedure in
“Powering on the DCS3700” on page 68.
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.
To shut down the system during an emergency, complete the following steps:
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 amber LEDs that are lit so that you can correct the problem when
you turn on the power again.
3. Turn off all power-supply switches, starting with the DCS3700 storage system first and followed by
the DCS3700 expansion enclosures. Then, disconnect the power cables from the storage subsystem.
Restoring power after an unexpected shutdown
To restore power to the storage subsystem after an unplanned shutdown, complete the following steps.
DANGER
Never turn on any equipment when there is evidence of fire, water, or structural damage.
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 that is attached to the storage subsystem?
v Yes: Do not continue with this procedure. Contact your IBM technical-support representative for
assistance. Depending on the current service agreements, you might have to return the equipment
to the factory or local service center for repair.
v No: Go to step 2 on page 86.
Chapter 4. Operating the DCS3700 storage system and expansion enclosure 85
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