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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.
BlackBerry Attachment
Service
load-balancing with primary
and secondary groups
When you install two or more BlackBerry Attachment
Service instances, you can create a BlackBerry Attachment
Service pool for each BlackBerry Enterprise Server
instance. You can configure a pool with a primary group of
instances and, optionally, a secondary group of instances.
The BlackBerry Enterprise Server sends all requests to the
primary group. If the primary group cannot convert a
specific file format, the
BlackBerry Enterprise Server
forwards conversion requests for the specific file format to
the secondary group.
BlackBerry Collaboration
Service
failover with an active
connection to one instance
and standby connections to
other instances
When you install two or more BlackBerry Collaboration
Service instances, you can create a BlackBerry
Collaboration Service pool for each BlackBerry Enterprise
Server instance. Each BlackBerry Enterprise Server assigns
one of the connections to the
BlackBerry Collaboration
Service
instances as the active connection, and the other
connections as standby connections. If the
BlackBerry
Collaboration Service that the active connection is assigned
to stops responding, the BlackBerry Enterprise Server
Feature and Technical Overview BlackBerry Enterprise Server high availability
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