User Manual

Storage System Hardware Components
90 Enterprise Virtual Array 3000 User Guide
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.
■ Providing enclosure status data to the controllers.
■ Reporting the WWN and the logical address of all drives.
Note: Although the EMU can determine the logical address of a drive, the EMU can
neither display nor change this information. Command View EVA can display the
addresses from the EMU-supplied status information.
EMU Monitoring Functions
The internal EMU circuitry monitors the enclosure and element functions listed in
Table 16.
.
Table 16: EMU Monitoring Functions
Element Monitored Functions
Blowers ■ Installation
■ Removal
■ Type
■ Speed (rpm)
Drives
■ Installation
■ Removal
■ Bypass status
■ Loop ID
■ Temperature
■ Drive fault
EMU ■ Temperature
■ Operation
■ Type
■ Revision level