Automatic Failover | High Availability | Teradata Data Mover - Automatic Failover - Teradata Data Mover

Teradata® Data Mover User Guide

Product
Teradata Data Mover
Release Number
17.00
Published
November 30, 2021
Language
English (United States)
Last Update
2021-11-04
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B035-4101
lifecycle
previous
Product Category
Analytical Ecosystem

Data Mover provides automatic failover support when two Data Mover clusters are configured in a active-standby configuration. Two additional monitoring severs are required to monitor the active and standby components. The monitoring service uses SSH connections to monitor the primary (or active) components to see if services are running. If any of the main components are down, a failover sequence is initiated. A failover is initiated in the following scenarios:

  • The active Data Mover daemon is unavailable
  • The active Data Mover repository is unavailable
  • All of the active Data Mover agents are unavailable
  • The active Data Mover REST service is unavailable
  • The active ActiveMQ is unavailable.
When failover occurs, all active components are shut down and the standby components are restarted in active mode. The sync service is restarted in standby mode on the old active server. The monitoring service used to monitor the old active components is shut down and the monitoring service is started on the remote site to monitor the new active components.
See the Teradata® Data Mover Installation, Configuration, and Upgrade Guide for Customers, B035-4102 for information on the following DSA restrictions and related configurations:
  • To enable failover for jobs using the DSA utility, preconfigure BAR NCs for the standby DSC environment (applicable regardless of database version).
  • Source and target databases using version 16.00 or later can and should be preconfigured for the standby DSC environment.
  • Source and target databases earlier than version 16.00 cannot be preconfigured if the active and standby Data Mover daemons are using the bundled DSC setup. When using multiple DSC environments to run jobs, you must reconfigure DSMAIN each time you want to run the same job after a Data Mover failover occurs.