HP StorageWorks 2405 Disk System - Manual (Page 15)

Product Description 15
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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