About high-availability deployments

Control Center can be deployed in a high-availability (HA) configuration to minimize downtime caused by the failure of hardware components or operating system services in a Control Center master host.

An HA deployment can be configured in a variety of ways, including the following:
  • Active-Active, non geo-diverse
  • Active-Passive, geo-diverse
  • Active-Passive, non geo-diverse (works with Control Center)
The Active-Passive configuration that works with Control Center:
  • uses Pacemaker, Corosync, and Distributed Replicated Block Device (DRBD) to manage the HA cluster
  • includes two or more identical master hosts in the HA cluster—one primary node and one or more secondary nodes, which take over as the Control Center master host if the primary node becomes unavailable
  • requires a minimum of two master hosts and two delegate hosts
  • provides no protection against a facility catastrophe because the HA cluster nodes are located in the same facility