Blackberry ENTERPRISE SOLUTION SECURITY - SECURITY FOR DEVICES WITH BLUETOOTH WIRELESS TECHNOLOGY - TECHNICAL Manual do Utilizador descarregar pdf (Página 62)

Both BlackBerry Enterprise Server instances in the BlackBerry Enterprise Server pair include, by default, the BlackBerry Attachment

Service, BlackBerry Dispatcher, BlackBerry MDS Connection Service, BlackBerry Messaging Agent, BlackBerry Policy Service,

BlackBerry Router, and BlackBerry Synchronization Service. By default, if you choose to install the BlackBerry Collaboration

Service with both instances, the BlackBerry Collaboration Service is included in the BlackBerry Enterprise Server pair.

To administer the BlackBerry Enterprise Server pair, you can install the BlackBerry Administration Service with both BlackBerry

Enterprise Server instances and configure high availability for the BlackBerry Administration Service separately.

In a large-scale environment, you can add any number of BlackBerry Enterprise Server pairs that use the same BlackBerry

Configuration Database.

How the BlackBerry Enterprise Server calculates health scores

Certain BlackBerry® Enterprise Server components calculate a health score that indicates how well the component can provide

specific services. The components send their health scores to the BlackBerry Dispatcher, which combines the health scores of

the components to calculate the overall health score of the BlackBerry Enterprise Server. The BlackBerry Dispatcher writes the

information to the BlackBerry Configuration Database, and it provides the information to a BlackBerry Enterprise Server that

requests it.

The BlackBerry Enterprise Server components calculate their health scores by examining their operating health, the stability of

their connections to other components, and the health scores of the other components.

The health score of the BlackBerry Enterprise Server consists of various health parameters. Each health parameter indicates

whether a particular service or feature is available. If you turn on the automatic failover feature for the BlackBerry Enterprise

Server, you can configure health parameters so that the BlackBerry Enterprise Server fails over automatically when critical services

or features are no longer available.

Conditions for failover to a standby BlackBerry Enterprise Server

Failover between the primary and standby BlackBerry® Enterprise Server instances occurs when the standby BlackBerry Enterprise

Server determines that its health score is above the promotion threshold and one or more of the following events occurred:

• The standby BlackBerry Enterprise Server receives a health score from the primary BlackBerry Enterprise Server that is below

the failover threshold.

• The standby BlackBerry Enterprise Server reads, in the BlackBerry Configuration Database, a health score for the primary

BlackBerry Enterprise Server that is below the failover threshold.

• The standby BlackBerry Enterprise Server does not receive a response when it checks the BlackBerry Dispatcher for the

health score of the primary BlackBerry Enterprise Server.

• The standby BlackBerry Enterprise Server pings the BlackBerry Dispatcher on the network but cannot determine whether

the primary BlackBerry Enterprise Server is running.

Feature and Technical Overview

How the BlackBerry Enterprise Server calculates health scores

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Blackberry ENTERPRISE SOLUTION SECURITY - SECURITY FOR DEVICES WITH BLUETOOTH WIRELESS TECHNOLOGY - TECHNICAL Manual do Utilizador Página 62