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The primary BlackBerry Enterprise Server connects to the messaging server and processes the messaging data that it
sends to and receives from BlackBerry devices.
The standby BlackBerry Enterprise Server opens standby connections to the principal BlackBerry Configuration Database
and the messaging server.
Scenario: What happens after the principal BlackBerry
Configuration Database stops responding
If a principal BlackBerry Configuration Database stops responding, the response of the primary BlackBerry Enterprise
Server depends on whether it can connect to the mirror BlackBerry Configuration Database.
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.
Feature and Technical Overview BlackBerry Enterprise Server high availability
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