Blackberry ENTERPRISE SOLUTION SECURITY - SECURITY FOR DEVICES WITH BLUETOOTH WIRELESS TECHNOLOGY - TECHNICAL Bedienungsanleitung PDF herunterladen (Seite 66)

The following responses assume that the messaging server and BlackBerry® Infrastructure are available.

Response of a primary BlackBerry Enterprise Server that can connect to the mirror BlackBerry Configuration Database

1. The primary BlackBerry Enterprise Server loses its connection to the principal BlackBerry Configuration Database.

2. The primary BlackBerry Enterprise Server connects to the mirror BlackBerry Configuration Database.

3. The primary BlackBerry Enterprise Server remains the primary instance.

Response of a primary BlackBerry Enterprise Server that cannot connect to the mirror BlackBerry Configuration Database

1. The primary BlackBerry Enterprise Server loses its connection to the principal BlackBerry Configuration Database.

2. The primary BlackBerry Enterprise Server tries to connect to the mirror BlackBerry Configuration Database, but is

unsuccessful.

3. The primary BlackBerry Enterprise Server lowers its health score and continues to provide limited services.

One of the following events occurs:

• If the standby BlackBerry Enterprise Server can open a connection to the principal or mirror BlackBerry Configuration

Database, it demotes the primary BlackBerry Enterprise Server and promotes itself to become the primary instance.

• If the standby BlackBerry Enterprise Server cannot open a connection to the principal or mirror BlackBerry

Configuration Database, it cannot promote itself. You must resolve any issues before the BlackBerry Enterprise Server

pair can recover.

High availability in a distributed environment

If you install multiple BlackBerry® Enterprise Server components on different computers to create a distributed environment, you

can configure the components for high availability. High availability for a distributed component requires that you install two or

more instances of the component in your organization's environment. When an instance stops responding, the other instances

can take over.

When you install multiple BlackBerry Enterprise Server components in a distributed environment, each BlackBerry Enterprise

Server component implements high availablility differently.

Component High availability type Description

BlackBerry Administration

Service

load balancing using DNS

round robin, or a hardware

load balancer

When you install two or more BlackBerry Administration

Service instances, you can create a BlackBerry Administration

Service pool. You can access the BlackBerry Administration

Service instances using a single web address. The load is

distributed across the instances. If a BlackBerry

Administration Service instance stops responding, the pool

routes requests to the available instances.

Feature and Technical Overview

High availability in a distributed environment

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Blackberry ENTERPRISE SOLUTION SECURITY - SECURITY FOR DEVICES WITH BLUETOOTH WIRELESS TECHNOLOGY - TECHNICAL Bedienungsanleitung Seite 66