There are several appliance database high availability failover scenarios, and vRealize Automation behavior varies depending on appliance database configuration and the number of nodes that fail.
Single Node Failure Scenarios
If one of the three nodes fails, vRealize Automation will initiate an auto failover. No additional auto failover operations can occur until all three nodes are restored.
The following table describes behavior and actions related to a master node failure in a high availability deployment.
Expected Behavior |
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Further Action |
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The following table describes behavior and actions related to a sync replica node failure in a high availability deployment.
Expected Behavior |
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Further Action |
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The following table describes behavior and actions related to a master node failure in a high availability deployment.
Expected Behavior |
No deployment downtime. |
Further Action |
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Two Node Failure Scenarios
If two out of the three nodes fail simultaneously, vRealize Automation switches to read only mode until a manual repair is performed.
The following table describes behavior and actions related to a master node and potential replica node failure in a high availability deployment.
Expected Behavior |
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Further Action |
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The following table describes behavior and actions related to Sync and Potential node failure in a high availability deployment.
Expected Behavior |
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Further Action |
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Links Failures Among Nodes
If a link failure occurs among nodes on a distributed deployment, the automatic failover agent attempts to repair the configuration.
The following table describes behavior and actions related to a link failure between two sites in a high availability deployment with the specified configuration when all nodes remain up and online.
Site A: Master and potential replica
Site B: Sync replica
Expected Behavior |
No downtime for the vRealize Automation deployment. The potential replica automatically becomes the sync replica. |
Further Action |
No manual action is required. |
The following table describes behavior and actions related to a link failure between two sites in a high availability deployment with the specified configuration when all nodes remain up and online.
Site A: Master
Site B: Sync and potential replica
Expected Behavior |
Sync replica becomes the master and automatically picks up appliance database functionality. Automatic failover agent promotes the potential replica to become the new sync replica. vRealize Automation deployment operates in read only mode until this promotion completes. |
Further Action |
No manual action is required. When the link is recovered, the automatic failover agent resets the former master as replica. |