NEC 1080Xd manual System Functions, Partitioning, Service Processor Board, Power/Status LEDs

Service Processor Board

The Service Processor Board (iSP-C Board) controls power and monitors status of all components (see Figure 1-4). The board uses a PowerPC chip as the processor for iSP-C, memory, LAN, serial interface, and clock distribution functionality. The Service Processor Board performs initialization of the system, RAS functions, diagnostic functions, failure management of the system, and clock generation and distribution.

Power/Status LEDs

Three LEDs are visible on the front of the server system cabinet (see Figure 1-2):

!AC

!DC

!Status.

See Table 1-1 for a description of the LEDs.

Table 1-1. Power/Status LEDs

LED	LED State		Description
AC	Green	On	AC power on.
		Off	AC power off.
DC	Green	On	DC power on (lights when DC48V is supplied).
		Off	DC power off.
Status LED	Green	On	OS ready (one node or more).
	Amber	On	System is in Maintenance mode (execution of the SP “cm”
			command).
		Off	Failure or offline state.

System Functions

The following subsections describe select system functions.

Partitioning

If your system includes two CELLV Boards and an optional core PCIX expansion unit, your server may be partitioned at the hardware level into two distinct subsystems, enabling each subsystem to operate as an independent computer system, each with its own operating system.

It is possible to divide the eight-CPU system into two subsystems, each of which has four CPUs, and let them each function separately. In this way it’s possible to allocate processor capacity according to workload status, resulting in flexible system operation.

Each partition is physically isolated by the hardware settings; a software error does not affect the other partitions. Thus the system can maintain high security.

1-10 System Overview