Installation and User's Guide

Switching the storage unit on and off

This section contains instructions for switching the storage unit on and off under normal and emergency circumstances.

If you are switching on the storage unit after an emergency shutdown or power outage, refer to "Switching on the storage unit after an emergency".

Switching on the storage unit

Use this procedure to switch on the power for the initial startup of the storage unit.

1. Verify that:
   1. All cables are properly attached.
   2. Both power cords are plugged into the back of the storage unit and into properly grounded electrical outlets.
   3. All hard disk drives are locked securely in place.
   4. All switches are set correctly: the internal option switches 1 through 4, external option switches 1 through 5, and the unit ID switch on the storage unit. See "Setting the interface options and ID settings", for more information.
2. Check the system documentation for all the hardware devices you intend to switch on and determine the proper power-on sequence.

   Note:

   Be sure to switch on the storage unit before or at the same time as you switch on the server.

3. Switch on each device, based on this power-on sequence.
4. Switch on both power supplies on the back of the unit.

   The storage unit might take a few seconds to switch on. During this time, you might see the fault (amber) and the power (green) LEDs on the storage unit turn on and off intermittently. When the power-on sequence is complete, only the power (green) LEDs on the front and back should remain on. If one or more fault (amber) LEDs remain lit, refer to "Troubleshooting".

   Attention: If you have data stored on the drives, label the drives before you remove them. Then, when you replace the drives, install each one in the same drive bay from which you removed it. Failure to do so will result in a loss of data.

Switching off the storage unit

Attention: Except in an emergency situation, never turn off the power if any fault LEDs are lit on the storage unit. Correct the fault before you attempt to turn off the power, using the proper troubleshooting or servicing procedure. This will ensure that the storage unit will turn on correctly later. Refer to "Troubleshooting".

Statement 5
Caution: The power control button on the device and the power supply do not turn off the electrical current supplied to the device. The device also might have more than one power cord. To remove all electrical current from the device, ensure that all power cords are disconnected from the power source.

The storage unit is designed to run continuously, 24 hours a day. Turn off the power only when at least one of the following is true:

• Instructions in a hardware or software procedure require you to turn off the power.
• A service technician tells you to turn off the power.
• A power outage or emergency situation occurs, see "Switching off the storage unit in an emergency".

Use the following procedure to turn off the storage unit:

1. Power down the server attached to the storage unit.
2. Make sure that all amber fault LEDs are off. If any fault LEDs are lit (drives, power supplies, or ESM boards), correct the problem before you turn off the power. For guidance, refer to "Troubleshooting".
3. Turn off both power supplies.

Switching off the storage unit in an emergency

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 will help safeguard your equipment from potential damage due to electrical surges when power is restored. If the storage unit loses power unexpectedly, it might be due to a hardware failure in the power system or midplane. Refer to "Troubleshooting".

Use the following procedure to turn off the storage unit during an emergency situation:

1. Power down the server attached to the storage unit.
2. If you have time, stop all activity and check the LEDs (front and back). Make note of any fault LEDs that are lit so that you can correct the problem when you switch on the power again.
3. Turn off all power supplies; then, unplug the power cables from the storage unit.

Switching on the storage unit after an emergency

Use the following procedure to restart the storage unit if you turned off the power supplies during an emergency shutdown, or if a power failure or a power outage occurred:

1. After the emergency situation is over or power is restored, check the storage unit for damage. If there is no visible damage, continue with Step 2; otherwise, have your unit serviced.
2. After you have checked for damage, plug in the expansion-unit power cables and switch on the power.
3. Check the system documentation for the hardware devices you intend to switch on, and determine the proper power-on sequence.

   Note:

   Be sure to switch on the storage unit before or at the same time you switch on the system unit.

4. Switch on each device, based on the power-on sequence.
5. Switch on both power supplies on the back of the storage unit.
6. Only the power (green) LEDs on the front and back should be on. If one or more of the fault (amber) LEDs are on, refer to "Troubleshooting", for instructions.
7. Use your installed software application as appropriate to check the status of the storage unit.