To configure BlackBerry® MDS Integration Service high availability, you can create a pool of two or more BlackBerry MDS Integration Service instances during the installation processes for the instances. BlackBerry MDS Integration Service clients (for example, the BlackBerry Administration Service, BlackBerry MDS Connection Service, and third-party applications) can access all of the BlackBerry MDS Integration Service instances in the pool using the same DNS name. All BlackBerry MDS Integration Service instances in the pool share a X.509 certificate that is stored in the BlackBerry MDS Integration Service database and that you can manage using the BlackBerry Administration Service.

Each BlackBerry MDS Integration Service instance communicates with the other instances in the pool to distribute the client traffic between each other. The BlackBerry MDS Integration Service pool maintains session stickiness between a BlackBerry device and a BlackBerry MDS Integration Service instance. If a BlackBerry MDS Integration Service instance stops responding or shuts down, the BlackBerry device sessions that the BlackBerry MDS Integration Service instance maintains are reassigned to other BlackBerry MDS Integration Service instances.

• High availability for the BlackBerry MDS Integration Service database
  
• BlackBerry MDS Integration Service high availability using DNS round robin
  
• BlackBerry MDS Integration Service high availability using a hardware load balancer
  
• Best practice: Planning for BlackBerry MDS Integration Service high availability
  
• Scenario: What happens after a BlackBerry MDS Integration Service instance stops responding
  
• Scenario: What happens to client traffic after a BlackBerry MDS Integration Service instance stops responding
  
• How a BlackBerry MDS Integration Service pool maintains sessions with BlackBerry devices