Power Verification And Addressing (Pva) Module - Compaq RA8000 User Manual

RA8000 and ESA12000 Storage Subsystems

1.3.3 Power Verification and Addressing (PVA) Module

Proper operation of the subsystem, whether it be a master or an expansion enclosure,
requires both a PVA module and an EMU module. The PVA (Figure 1-11) and its
associated EMU ensures that all major UltraSCSI components are functioning properly.
When an error condition occurs, these modules notify the user that a problem exists. The
array controller identifies the specific problem. The PVA and EMU LED displays identify
possible causes of the problem.
The PVA mounts in the lower right section of the enclosure, directly above the array
controller. The PVA and EMU have the same physical dimensions, use the same type
connectors, and are mounted next to each other – the EMU on the left and the PVA on the
right (see Figure 1-4). They are not interchangeable.
Figure 1–11 Power Verification and Addressing (PVA) Module
As shown in Figure 1-11, the major user-accessible components of the PVA include the
following:
•
The dc power shutoff switch which includes a green power status LED
•
The UPS connector (RJ-45) for future UPS monitoring capability
•
The enclosure SCSI address switch that establishes the enclosure address and thereby
the SCSI bus IDs for each storage device
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