Powering On and Off the Array

The J4500 array has two levels of power: standby power and main power. The initial setup of the array should be done before plugging in AC power. The procedures for powering on to main power mode and going from main power mode to standby power mode are included in this section.

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Caution - Do not operate the array enclosure without all fans, component heatsinks, air baffles, and covers installed. Severe damage to array components can occur if the enclosure is operated without adequate cooling mechanisms.

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To Power On the Array

The proper power-up sequence for a system connected to the J4500 array is to first power on the array, wait one minute, then power on the host server. This wait time allows all 48 array hard disk drives to power up to the point where the server can see them and helps reduce the number of start-up device link messages saved to the server's log file.

To apply main power to the array, do the following:

1. Connect two grounded AC power cords to the two AC power supply connectors at the back of the array enclosure.
2. Then connect the other ends of the two AC power cords to grounded AC (110-220 VAC) power outlets.

   Connecting the AC power cords to the array automatically applies main power to the array. In main power mode, the array Power/OK LED next to the Power button lights and remains lit.

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   Note - See the service label on the hard disk drive access cover for an explanation of the LEDs on the hard disk drives, fans, power supply, and system controller. Or, refer to the Sun Storage J4500 Array Service Manual (820-3160) on the Sun documentation web site http://docs.sun.com.

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To Place the Array Into Standby Power Mode

The front panel power button is used to switch the array from main power to standby power (or from standby power back to main power). Standby power mode leaves the power supplies partially on, but powers down the array hard disks, SAS expanders and SAS links.

1. To switch the array enclosure from main power mode to standby mode, use a stylus to press and hold in the power button on the front panel (see Sun Storage J4500 Array Front Panel Controls and Indicators ) for 5 or more seconds (during which the locate LED will flash).

   As the enclosure enters standby power mode, the Power/OK LED on the front and back panel blinks, indicating that standby power mode is working. For the power LED location, see Sun Storage J4500 Array Front Panel Controls and Indicators and Sun Storage J4500 Array Back Panel.

2. Release the power button on the front panel.

   With AC power connected, the array takes about 10 seconds to go fully into standby power mode.

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   Caution - To power off the array completely, you must disconnect the AC power cords from the power supplies at the back of the array enclosure. It takes a full 20 seconds with the AC power cords unplugged for internal power to be completely drained from the enclosure.

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3. To reapply main power to the array from standby power mode, use a stylus to press and release the recessed Power button on the array front panel. See Sun Storage J4500 Array Front Panel Controls and Indicators .

   When main power is applied to the array, the Power/OK LED next to the Power button lights and remains lit.

To Power Off the Array

To power off the array completely, you must disconnect the AC power cords from the power supplies at the back of the array enclosure. The power switch is only used for switching the array to standby power mode, or to main power from standby power mode. Do the following to power off the array:

• To completely power off the array, disconnect the two AC power cords from the power supplies at the back of the enclosure.

  It takes a full 20 seconds with the AC power cords unplugged for the internal power to be completely drained form the enclosure.

AC Power Failure Auto-Recovery

If AC power is temporarily lost to the array, for example if the municipal power grid experiences an outage, the array automatically restarts to main power mode when power is restored. No user intervention is required.

The same behavior occurs if you disconnect the AC power cords from the back of a powered-on array and then reconnect them.