The state of individual Sequencer processes on each paired Unity server determine HA status.
This table describes the states that indicate status of paired HA servers.
| Status | Description |
|---|---|
| Not Enabled | Indicates the Unity servers are not paired for high availability. |
| In Peer | Indicates one of the Sequencer processes is in the Active state, and the other is in the Standby Synchronized state. |
| Not in Peer | Indicates the Unity servers are paired, but the Sequencer process cannot perform an automatic failover. |
| Establishing Peer | Indicates the Unity servers are paired, but the Sequencer process cannot perform an automatic failover. |
| Split Brain | Indicates the Unity servers are paired, but the Sequencer process cannot perform an automatic failover. |
You must intervene if the Sequencer process cannot perform an automatic failover.
This table describes the relationship between the states of both Sequencer processes and the resulting paired HA status.
| Sequencer State | Combination | Paired HA Status |
|---|---|---|
| Down | Waiting | Not in Peer: Waiting for Sequencer startup |
| Waiting | Waiting | Establishing Peer: Waiting for Sequencers |
| Active | Standby-Synchronizing | Establishing Peer: Synchronizing |
| Active | Standby | In Peer |
| Active | Standby-Unsynchronized | Not in Peer: Cannot fail over |
| Active | Down | Not in Peer: Cannot fail over |
| Down | Standby-Unsynchronized | Not in Peer: Cannot fail over |
| Active | Active | Split Brain |
| Disabled | Disabled | Split Brain |