Blowers; Drive Enclosure Emu; Power Supply/Blower Status Indicators - HP StorageWorks 6100 - Enterprise Virtual Array User Manual

Power supply status and diagnostic information is reported to the EMU with voltage, current, and
temperature signals.
See Regulatory Notices and Specifications
The power supply temperature sensor provides a temperature range signal to the EMU, which uses
this signal to set the
The power supply internal temperature can also control the speed of the blower. The higher the power
supply temperature, the faster the speed of the blower. If the power supply temperature exceeds a
preset value, the power supply automatically shuts down.

Blowers

The power supply-mounted blowers cool the enclosure by circulating air through the enclosure. The
blowers, under the control of the EMU or the associated power supply, can operate at multiple speeds.
This ensures that, when the enclosure temperature changes, the blowers can automatically adjust the
air flow.
If a blower is operating too slowly or has stopped (a "blower failure"), internal circuitry automatically
operates the remaining blower at a higher speed. Simultaneously, the error condition is reported in
several ways, including the power supply indicator, the audible alarm, the enclosure fault indicators,
and the EMU alphanumeric display.
Should both blowers fail, the power supplies automatically shut down.
NOTE:
The blowers are field-replaceable units and can be replaced, individually, while the system is running.
The blowers are also interchangeable. The failure of a power supply +12.5 VDC circuit disables the
associated blower.
The status indicator on the blower displays the status of both the power supply and the blower. See
Figure 17. See
Table 11 Power supply/blower status indicators
Blower status indicator
On
Flashing
Off

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.
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
blower speed.
Table 11 for definitions of the indicator displays.
Both the power supply and the blower are operational.
The power supply or the blower locate function is active.
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 proper operation. Replace if defective.
HP StorageWorks 4x00/6x00/8x00 Enterprise Virtual Array user guide
for the enclosure power specifications.
Description
Figure 11.
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