Installation and User's Guide

Rear controls, indicators, and connectors

Two hot-swap power supplies with built-in fans and two environmental services monitor (ESM) boards are accessible from the back of the storage unit. These components contain several user indicators and connectors.

Power-supply controls, indicators, and connectors

The following is a list of the controls, indicators, and connectors at back of the storage unit. A description of each item is included:

Thumbscrews

Loosen the thumbscrews to remove or install a power supply.

AC power connector

The power cord for the power supply connects here.

Power-supply/Fan CRU

The two hot-swap power supplies with built-in fans are located on the back of the storage unit.

Attention: The storage unit comes with two power-supply/fan units installed. When one power supply fails, the power-supply unit must be replaced to re-establish redundancy. When replacing the failed unit with the new power supply unit, ensure that this operation is performed in less than 10 minutes to prevent any overheating.

The fan that is visible from the rear of the power supply is an auxiliary fan that is normally off. This fan turns on only when the main fan within the power supply fails.

Power on/off switch

Use this switch to turn the power supply on and off.

Fault LED (amber)

When completely lit, this amber fault LED indicates a power supply failure or that a redundant power supply is not on. This LED also flashes when the built-in fan fails.

DC power LED (green)

This green LED is lit when the storage unit is turned on and is supplying both 5 V and 12 V dc power.

AC power LED (green)

This green LED is lit when the storage unit is receiving ac power.

Handles

The two handles are used for installing and removing the power supply.

ESM board user controls

Two environmental services monitor (ESM) boards are accessible from the back of the storage unit. These components contain several user controls, indicators, and connectors.

ESM board

The environmental services monitor (ESM) boards contain the SCSI controls, LEDs, and connectors.

Fault LED (amber)

When lit, this amber LED indicates an ESM board failure.

SCSI reset LED

When lit, this green LED indicates a SCSI bus reset.

Push pins

Each ESM board has an orange push pin at the lower left of the board. Use the orange push pin and lever to remove and insert the ESM board.

Termination-power LED (green)

When lit, this green LED indicates that termination power is present. When a termination-power LED is lit, it indicates that the other end of the cable is connected to a powered-on controller. Each external bus has a separate termination-power LED.

LVD/SE LED (green)

When lit, this green LED indicates that the external host bus is in low voltage differential (LVD) mode. When this LED is off, this indicates that the external host bus is in single-ended (SE) mode. Each external bus has a separate LVD/SE LED. Only LVD host bus controllers are supported.

SCSI bus connector

The 68-pin Very High Density Connector Interface (VHDCI) connectors are for attaching your SCSI cables to SCSI bus 1 and SCSI bus 2.

Activity LED (green)

When lit, this green LED indicates there is activity on the external SCSI bus. Each external bus has a separate activity LED.