HP NonStop G-Series - Manual (Page 269)

the associated fan and power supply and to regulate the voltage supplied to the fans. It
also provides the interface to the
group identification switches and service LEDs . There
are two PMCUs in each group, one for each of the two DC power distribution buses.
power supply
In system enclosures without power shelves, the component that converts standard AC
line voltage into the DC voltages needed by the group components in the enclosure.
In system enclosures with power shelves, the component located in the power shelf that
converts standard AC line voltage into DC voltage and delivers it to the CRUs in that
enclosure, which in turn supply the DC voltages needed by the group components in the
enclosure.
primary processor
The processor that is designated as owning the ServerNet addressable controller (SAC)
connected to separate processors running the NonStop Kernel operating system. The
primary processor is the processor that has direct control over the SAC.
See also backup processor .
problem incident report
A type of incident report that notifies you of a problem on your server or ServerNet
cluster. A problem incident report is generated when changes occur that could directly
affect the availability of resources. Problem incident reports include the system
configuration file and might include other attachments, such as alarm logs and processor
diagnostic information.
See also periodic incident report .
processor
A functional unit of a computer that reads program instructions, moves data between
processor memory and the input/output controllers, and performs arithmetic operations.
Processors are sometimes referred to as central processing units (CPUs), but a NonStop
server has multiple cooperating processors rather than a single CPU.
processor and memory board (PMB) CRU
Part of the processor multifunction (PMF) CRU . A logic board that has the following
computer chips: lockstepped microprocessors, the main memory system, and the
ServerNet memory interface.
processor multifunction (PMF) CRU
A NonStop S-series customer-replaceable unit (CRU) that contains a power supply ,
service processor (SP) , ServerNet router 1, Ethernet controller, three ServerNet
addressable controllers ( SACs ), and a processor and memory system in a single unit. The
PMF CRU consists of three subassemblies: the processor and memory board ( PMB ), the