Intel ZT 4901 manual Introduction, Terminology, Following terms are commonly used in this document

Introduction 2

Intel® High Availability (HA) systems feature built-in redundancy for active system components such as power supplies, system master processor boards, and system alarms. Redundant Host (RH) systems are HA systems that feature an architecture allowing the Active Host system master processor board to hand over control of its bus segment to a Standby Host system master processor board.

This section gives an overview of the hardware and software used in systems supported by Intel’s High Availability Software Development Kit (HASDK).

The following figure shows how the basic elements in an HASDK system are related.

Figure 1. High-Availability CPU Architecture

				Host		Available Host
				Application
Current Host			Host
			Application
						RH	RH
							Comm
					Driver	Driver
							Driver
OS/Drivers	Slot	Comm	Backplane	Hot Swap	RH	RH
	Control					Comm
		Driver	Driver	Driver	Driver
	Driver					Driver
		Slot			CompactPCI		RH Comm
						Interface	Controller
						Controller
Hardware	Slot	Comm	PCI-to-PCI		CompactPCI	RH Comm
					Interface	Controller
	Controller	Controller	Bridge
					Controller
				CompactPCI Bus

2.1Terminology

The following terms are commonly used in this document:

Active Host (also known as Current Host, owner, or bus segment owner)—A board is said to be Active or the Active Host if it is providing System Host functions to the peripherals in a CompactPCI backplane. This means that it is the Owner of at least one bus segment.

High Availability Software for the Intel® NetStructureTM ZT 4901 Technical Product Specification 11