16.10 - Paired High Availability Status - Teradata Unity

Teradata Unity User Guide

Product
Teradata Unity
Release Number
16.10
Published
January 2018
Language
English (United States)
Last Update
2018-03-29
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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