HP 3000 Enterprise Virtual Array - Manual (Page 88)

Storage System Hardware Components
88 Enterprise Virtual Array 3000 User Guide
Should a blower be operating too slowly or stopped (a “blower failure”), internal
circuitry automatically causes the remaining operational blower to operate at a
higher speed. Simultaneously, the error condition is reported in several ways,
including the power supply LED, the audible alarm, the enclosure fault LEDs, and
the EMU alphanumeric display.
Should both blowers fail, the power supplies automatically shutdown.
Note: The failure of a power supply +12.5 VDC circuit disables the associated blower.
Power Supply and Blower Status Reporting
The green status LED on the blower displays the status of both the power supply
and the blower. See
Table 15 for definitions of the LED displays.
Drive Enclosure EMU
The EMU provides increased protection against catastrophic failures. The EMU
communicates with the HSV Controller to detect conditions such as failed power
supplies, failed blowers, elevated temperatures, and external air sense faults.
The EMU for Fibre Channel-Arbitrated Loop (FC-AL) drive enclosures is fully
compliant with SCSI-3 Enclosure Services (SES), and mounts in the left rear bay
of a drive enclosure. See
1 , Figure 40 .
Table 15: Power Supply and Blower Status LED Display
Blower Status LED Description
On Both the power supply and the blower are operational.
Flashing The power supply or the blower locate function is active.
Off The power supply or the blower is nonoperational. When
there is a blower problem, the other blower runs at a higher
speed.
Recommended corrective actions:
1. Check blower for proper operation. Replace if defective.
2. Check power supplies for proper operation. Replace if
defective.