HP 4000.6000.8000 Enterprise Virtual Arrays - Manual (Page 27)

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
Figure 6 (page
20) .
Controls and displays
Figure 13 (page 27) illustrates the location and function of the EMU displays, controls, and
connectors.
Figure 13 EMU controls and displays
1. Status indicators:
a. EMU — This flashing green is the heartbeat for an operational EMU.
b. Enclosure power— When both the +5 VDC and +12 VDC are correct, this green indicator is on.
c. Enclosure fault — This amber indicator is normally off. The indicator is lit when an enclosure error condition exists.
2. Alphanumeric display — A two-character, seven-segment alphanumeric display of the enclosure functions and status.
3. Function select button — The primary function of this button is to select a display group function. The indicator is on
when an error condition exists.
4. Display group select button — This button is used to view display groups and control the audible alarm. The indicator
is on when the audible alarm is muted or disabled.
5. RS232 – For use by HP-authorized service representatives
6. LCD ONLY – Unused
7. CAB ONLY – Enclosure address bus connector
WARNING! To reduce the risk of electrical shock, fire, or damage to the equipment, do not plug
telephone or telecommunications connectors into the RS232 ONLY receptacle.
EMU functions
The primary functions of the EMU include:
•
Using the Enclosure Services Processor (ESP) to control the Enclosure Services Interface (ESI)
and communicate with the controllers.
•
Assigning the Enclosure Number (En), based upon the cabinet address bus feature.
•
Displaying the bay 1 loop ID.
•
Monitoring enclosure operation.
•
Detecting, reporting, recording, and displaying conditions.
•
Displaying EMU, enclosure, and element status.
•
Implementing automatic corrective actions for some conditions.
Fibre Channel drive enclosures 27