C H A P T E R 5

Powering On the Array

This chapter describes initial tray power-on procedures in the following sections:

- Before Powering On

- Connecting Power Cables

- Powering On the Array

- Powering Off the Array

- Next Steps

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Before Powering On

Decide on an IP address method before powering on.

- The controllers will obtain IP addresses from DHCP if it is available on the network.

- If DHCP is not available, the controller tray defaults to internal static IP addresses. (See the Sun Storage Common Array Manager Software Installation and Setup Guide for information about configuring IP addresses on controller modules.)

- For instructions on configuring IP addresses on the controllers using the serial interface, see Configuring the IP Address of the Controller Modules.

- For an example of how to set up the DHCP server, see Configuring a DHCP Server.

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Connecting Power Cables

The controller tray and the expansion tray can have either standard power connections to an AC power source or the optional connections to a DC power source (-48 VDC).

Note - Do not turn on the power to the controller tray or the connected expansion trays until this documentation instructs you to do so. For the correct procedure for turning on the power, see Powering On the Array.

### About AC Power Cords

- For each AC power connector on the expansion tray, make sure that you use a separate power source in the cabinet. Connecting to independent power sources maintains power redundancy.

- To ensure proper cooling and assure availability, the expansion trays always use two power supplies.

- You can use the power cords shipped with the expansion tray with typical outlets used in the destination country, such as a wall receptacle or an uninterruptible power supply (UPS). These power cords, however, are not intended for use in most EIA-compliant cabinets.

### Connecting AC Power Cords

1. Make sure that the circuit breakers in the cabinet are turned off.

2. Make sure that both of the Power switches on the expansion trays are turned off.

3. Connect the primary power cords from the cabinet to the external power source.

4. Connect a cabinet interconnect power cord (or power cords specific to your particular cabinet) to the AC power connector on each power module in the expansion tray.

5. If you are installing other expansion trays in the cabinet, connect a power cord to each power module in the expansion trays.

### About DC Power Cords

If your expansion tray has the DC power option installed, review the following information.

FIGURE 5-1 DC Power Cable

1 | Supply (negative), brown wire, -48 VDC | 3 | Ground, green/yellow wire
2 | Return (positive), blue wire | 4 | DC power connector

- Each power-fan module has two DC power connectors. Be sure to use a separate power source for each power-fan module in the expansion tray to maintain power redundancy. You may, optionally, connect each DC power connector on the same power-fan module to a different source for additional redundancy.

- A two-pole, 30-amp circuit breaker is required between the DC power source and the expansion tray for over-current and short-circuit protection.

### Connecting DC Power Cords

| Caution - Risk of bodily injury--A qualified service person is required to make the DC power connection according to NEC and CEC guidelines.

Note - Do not turn on power to the expansion tray until this guide instructs you to do so. For the proper procedure for turning on the power, see Powering On the Array.

1. Disconnect the two-pole, 20-amp circuit breaker for the storage array.

2. Make sure that all of the DC power switches on the DC-powered expansion tray are turned off.

3. Connect the DC power connector cables to the DC power connectors on the rear of the controller tray or controller tray, and expansion trays.

Note - The three source wires on the DC power connector cable (-48 VDC) connect the expansion tray to centralized DC power plant equipment, typically through a bus bar located above the cabinet.

Note - It is not mandatory that the second DC power connection on each of the expansion tray’s DC power-fan modules be connected. The second DC power connection is for additional redundancy only and can be connected to a second DC power bus.

4. Have a qualified service person connect the other end of the DC power connector cables to the DC power plant equipment as follows:

a. Connect the brown -48 VDC supply wire to the negative terminal.

b. Connect the blue return wire to the positive terminal.

c. Connect the green/yellow ground wire to the ground terminal.

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Powering On the Array

1. Turn on both Power switches on each expansion tray that is attached to the controller tray. Depending on your configuration, it can take several minutes for each expansion tray to complete the power-on process.

While the power is being applied to the trays, the LEDs on the front and the rear of the trays come on and go off intermittently

2. Check the LEDs on the expansion trays to verify that the power was successfully applied to all of the expansion trays. Wait 30 seconds after turning on the power to the expansion trays before turning on the power to the controller tray.

3. Turn on both Power switches on the rear of the controller tray. Depending on your configuration, it can take several minutes for the controller tray to complete the power-on process.

4. Check the LEDs on the front and the rear of the controller tray and the attached expansion trays.

5. If you see any amber LEDs, make a note of their location.

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Powering Off the Array

The array rarely needs to be powered off. You remove power only when you plan to physically move the storage array to another location or are adding additional trays to a controller tray.

| Caution - Before turning off any power switches on a DC-powered expansion tray, you must disconnect the two-pole, 30-amp circuit breaker.

1. Stop all I/O from the hosts, if connected, to the storage array.

2. Wait approximately two minutes until all disk drive LEDs have stopped flashing.

Note - If Disk Scrubbing is enabled, the disk drive LEDs will continue to flash after the 2-minute period has elapsed. By waiting the 2-minute period, you ensure that the data residing in cache has been written to disk. The LED flash rate during disk scrubbing (slow, periodic blink) is different from the flash rate of I/O (fast, random).

After the 2-minute period, data residing in cache is written to disk and the battery mechanisms are disengaged.

3. Check the Cache Active LED on the controller to determine if any outstanding cache needs to be written.

If the LED is on, there is still data that needs to be flushed and written to disk.

4. Ensure that the Cache Active LED is no longer flashing before powering off the storage array.

5. Press each power switch at the back of the controller tray to the Off position.

6. Press the power switches at the back of each expansion tray to the Off position.

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Next Steps

After you have connected the management host and data hosts, you are ready to install the management host software as described in the Sun Storage Common Array Manager Quick Start Guide or the Sun Storage Common Array Manager Installation and Setup Guide.

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