Motorola 6806800C44B manual Availability Service Subparts, Service Structure Overview Introduction

Service Structure Overview Introduction

zAvailability Agent

zCluster Membership Agent

Figure 1-1 Availability Service - Subparts

1.2.1.1Availability Manager

NetPlane Core Services’ Availability Manager (AvM) maintains the hardware model of the system above. It acts as a bridge between the Availability Management Framework (AMF) and the Hardware Platform Interface (HPI). It supports activation and deactivation of field- replaceable units (FRUs), Reset Management, Lock Management, and Fault Management. AvM interacts with internal role distribution and fault management mechanisms to capture the role of system manager hosts and propagate it to the AMF. It is also used to trigger administrative switchovers of system manager hosts. AvM resides on both the active and standby system manager hosts.

1.2.1.2Availability Director

The Availability Director (AvD) maintains the entire system model, consisting of nodes, the Service Groups (SG), their constituent Service Units (SUs), their constituent components, and their corresponding component service instance (CSI) and service instances (SIs) that are in the system. There is an active and a standby instance of the AvD in a system. The AvD runs as part of a System Construction and Availability Process (SCAP) on the system manager host.

Its main tasks include fault detection, isolation and recovery procedures as defined in the SAF AMF. Any problems and failures on a component that cannot be handled locally, are prompted to the Availability Director which controls and triggers the isolation of the affected component and, if possible, the activation of a stand-by component.

Availability Service Programmer’s Reference (6806800C44B) 15