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10. After you perform the necessary maintenance procedures, turn on the power
Performing an emergency shutdown
Attention:
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
2. Check the LEDs. Make note of any Needs Attention LEDs that are on so you
3. Turn off all power supply switches, starting with the DS4200 Express storage
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
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 controller in the storage
subsystem.
Note: Until the power switch on each controller is turned off, power still
remains turned on for the both controllers; therefore, the seven-segment
display on each controller stays on until the power switch on each
controller is turned off.
9. Turn off both power switches on the back of each storage expansion enclosure
in the configuration.
using the procedure in "Turning on the storage subsystem" on page 81.
Emergency situations might include fire, flood, extreme weather
the host or disconnecting the storage subsystem logical drives through the host.
can correct the problem when you turn on the power again.
subsystem first, and followed by the storage expansion enclosures. Then,
unplug the power cables from the storage subsystem.
storage subsystem for damage. Is there evidence of damage to any of the
storage subsystem components, cables, or equipment attached to the storage
subsystem?
Chapter 4. Operating the storage subsystem
97
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