Instruction Manual

NOTE:
The blower units are field- replaceable units. The units can be replaced, individually, while the system is
running. The units are also interchangeable. The failure of a power supply +12.5 VDC circuit disables
the associated blower.
Power supply and blower status reporting
The gr een 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.
Table 15 Power supply/blower status indicators
Blower status LED
Description
On
Both the power supply and the blower are o perational.
Flashing
Thepowersupplyortheblowerlocatefunctionisactive.
Off
The power supply or the blower is non–operational. When there is a blower problem,
the other blower runs at a higher speed. Recommended corrective actions:
• Check blower for proper operation. Replace if defective.
• Check power supplies for p roper operation. Replace if defective.
Drive enclosure EMU
The EMU provides increased protection against catastrophic failures. The EMU detects conditions such
as failed power supplies, failed blowers, elevated temperatures, and external air sense faults and
communicates these conditions to the storage system controllers.
Figure 31 shows the drive enclosure EMU as a standalone unit.
CXO6697
A
Figure 31 Drive enclosure EMU
The E MU 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 32).
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Storage system hardware components