Compaq System/E25 User's Guide download pdf (Page 15)

Product Description 15

Product Description

Status Indicators

LEDs on the disk system enable you to detect and replace failed components and

thereby prevent or minimize users’ downtime. For additional information about

LEDs, see chapter 4, Troubleshooting.

On the front of the disk system, a pair of LEDs indicates the status of the disk

system, and an LED for each slot shows disk I/O activity:

■ The system power LED (B in Figure 1) indicates that power is on or off.

■ The system fault LED (C in Figure 1) indicates whether or not a fault has

occurred anywhere in the disk system.

■ At the bottom of each disk module, the left LED (D in Figure 1) indicates the

presence of I/O activity on the disk.

■ The right LED, at the bottom of each disk module (E in Figure 1), can be

flashed to help a customer engineer (CE) locate the disk for physical

inspection or removal.

LEDs (G and J in Figure 2) on the back of the disk system indicate the status of

replaceable components. See chapter 4, Troubleshooting, for specific LED

information.

Power/Standby Switch

Located in the upper right corner of the front of the disk system, the power switch

(A in Figure 1) interrupts power from the power supplies to the LCCs and other

internal components. Power to the power supplies is controlled by the power

cords and the AC source.

High Availability

High availability is a general term describing computer systems that are designed

to minimize unplanned downtime. The disk system supports high availability

requirements through the following features:

■ Hot-pluggable, high-capacity, high-speed disks

■ Redundant, hot-pluggable, user-replaceable power supplies and LCCs

■ Support for mirrored disks in the HP-UX environment

■ Online firmware upgrades

■ Hardware event monitoring and real-time error reporting

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Compaq System/E25 User's Guide Page 15