Q-SYS Core Redundancy

A second or Backup Core can be paired with the Primary Core in an installation. Initially, the Primary Core is the Active Core, and the Backup Core is the Standby Core.

In a Core-redundant system, the Standby Core is responsible for constantly communicating with the Active Core so as to verify the health of the Active Core, and to synchronize its control settings, snapshots and event schedules with the Active Core. The Standby Core also communicates with the peripherals so as to verify its readiness to take over.

Failover Process

If the Standby Core detects a fault with the Active Core, it establishes full audio streaming and control communications with peripherals and becomes the "active" Core. If the Primary, for whatever reason, does not actually go into standby during a failover, the Backup has priority and remains the Active Core.

During a failover, the audio peripherals are muted, and are then un-muted once the backup becomes active. An automatic failover, in which the backup must automatically decide to go active, takes about 10 seconds. If the backup is manually instructed to go active, the process takes about 3 seconds.

After a failover, Q-SYS does not automatically change back to the failed Core when the Core recovers. This is to prevent additional audio gaps. You can manually change back at an appropriate time.

Note that:

Requirements

To enable Core redundancy in your design, set the Is Redundant property in Core Properties to 'Yes', and then specify the Backup Core name. Additional requirements are listed below.

Note: Both the primary and backup Cores must be present and online during system installation so that both get configured with the proper design data.