A Hot Standby Node (HSN) is a node that is a member of a clique that is not configured (initially) to execute any Teradata vprocs. If a node in the clique fails, the AMPs from the failed node move to the hot standby node. The performance degradation is 0%.
When the failed node is recovered/repaired and restarted, it becomes the new hot standby node. A second restart of Teradata is not needed.
Characteristics of a hot standby node are:
- A node that is a member of a clique.
- Does not normally participate in the trusted parallel application (TPA).
- Can be brought into the configuration when a node fails in the clique.
- Helps with unplanned outages.
- Eliminates the need for a restart to bring a failed node back into service.