Motorola 6806800C44B manual Introduction, Overview

Introduction

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1.1Overview

The NCS Availability Service (AvSv) is the core service of the NetPlane software. It provides service availability to applications by coordinating the redundant resources in a cluster to provide a system with no single point of failure. It provides high-availability mechanisms to the application software it manages. These include life-cycle management of application software, fault detection, fault isolation, escalation, recovery, and repair.

The AvSv functionality is a highly compliant implementation of Service Availability Forum’s Application Interface Specification of Availability Management Framework (SAI-AIS-AMF- B.01.01) and Cluster Membership Service (SAI-AIS-CLM-B.01.01).

The Availability Service (AvSv) provides the following functionality:

zLeverage the SAF "System Description and Conceptual Model"

zHonour the Availability Management Framework" API

zHonour the SA Cluster membership Service API

zHouse the MIB tables corresponding to the hardware portion of the deployment system description which includes entity containment and fault domain hierarchy information

zHouse the MIB tables corresponding to the software portion of the deployment system description which include configuration of AMF-defined logical entities and their relationship

zPerform blade validation on receipt of HPI hot swap insertion events

zHandle fault events such as HPI hot swap extraction events, threshold crossing events etc.

The AvSv maintains a software system model database which captures SAF-described logical entities and their relationships to each other. The software system model database is initially configured from data contained in the System Description file. Through time the system model will modify due to changing system realities and administrative actions.

The SAF logical entities related in the system model include components which normalize the view of physical resources such as processes, drivers or devices. Components are grouped into Service Units according to fault dependencies that exist among them. A Service Unit is also scoped to one or more (physical) fault domains. Service Units of the same type are grouped into Service Groups (SG) which exhibit particular redundancy modelling characteristics. Service Units within a SG are assigned to Service Instances (SI) and given a High Availability state of active and standby.

The hardware database maintained by AvSv includes hardware entity containment information and the hardware fault domain hierarchy. All hardware entities are represented by their HPI entity paths. The hardware entity containment tree only includes managed FRUs which may or may not include processor environments., and non-FRU resources which include processor environments. The fault domain data includes dependency relationships between parent-child

Availability Service Programmer’s Reference (6806800C44B) 13