Verify the Cluster Status | Teradata Data Mover - Verify Cluster Status - Teradata Data Mover

Teradata® Data Mover User Guide - 20.01

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
Lake
VMware
Product
Teradata Data Mover
Release Number
20.01
Published
November 2023
Language
English (United States)
Last Update
2023-12-05
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Product Category
Analytical Ecosystem

Use the dmcluster status command to check the status of a failover cluster.

Active Mode

When Data Mover services run on the primary servers and are monitored by the primary monitor, the cluster is in active mode. When checking the status of an active cluster with the dmcluster status command, the following displays:
------------------------------------------------------------------------
                        | LOCAL CLUSTER       |
------------------------------------------------------------------------
| COMPONENT             |         HOST NAME   |         STATUS         |
------------------------------------------------------------------------
| DM Daemon             |         DM1         |         RUNNING        |
| ActiveMQ              |         DM1         |         RUNNING        |
| DM Monitoring Service |         VP1         |         RUNNING        |
| DM Sync Monitor       |         DM1         |         RUNNING        |
| DM REST Service       |         DM1         |         RUNNING        |
| DSC                   |         DM1         |         RUNNING        |
| DSA REST              |         DM1         |         RUNNING        |
| DM Agent              |         DM1         |         RUNNING        |
| DM Agent              |         DM2         |         RUNNING        |
| DM Agent              |         DM3         |         RUNNING        |
------------------------------------------------------------------------
                        | REMOTE CLUSTER      |
------------------------------------------------------------------------
| COMPONENT             | HOST NAME           |              STATUS    |
------------------------------------------------------------------------
| DM Daemon             |         DM2         |         STOPPED        |
| ActiveMQ		|         DM2         |         STOPPED        |
| DM Monitoring Service |         VP2         |         STOPPED        |
| DM Sync Monitor       |         DM2         |         STOPPED        |
| DM REST Service       |         DM2         |         STOPPED        |
| DSC                   |         DM2         |         STOPPED        |
| DSA REST              |         DM2         |         STOPPED        |
| DM Agent              |         DM2         |         STOPPED        |
| DM Agent              |         DM1         |         RUNNING        |
| DM Agent              |         DM2         |         RUNNING        |
| DM Agent              |         DM3         |         RUNNING        |
------------------------------------------------------------------------

Cluster Mode: DM Cluster is in 'Active Mode'

When the primary Data Mover sync monitor is running and monitoring the synchronization progress from the primary to secondary repository, the secondary Data Mover sync monitor is not in use.

Standby Mode

When failover occurs, Data Mover services run on the secondary server and monitored by the secondary monitor, the cluster is in standby mode. When checking the status of a cluster in standby mode with the dmcluster status command, the following displays:
Executing the STATUS command...

-----------------------------------------------------------------------------
|                          PRIMARY CLUSTER (STANDBY)                        |
-----------------------------------------------------------------------------
| COMPONENT                      | HOST NAME            | STATUS            |
-----------------------------------------------------------------------------
| DM Daemon                      | DM1 (LOCAL)          | STOPPED           |
| ActiveMQ                       | DM1 (LOCAL)          | STOPPED           |
| DM REST Service                | DM1 (LOCAL)          | STOPPED           |
| Cloud Staging Service          | DM1 (LOCAL)          | STOPPED           |
| DSC                            | DM1 (LOCAL)          | STOPPED           |
| DSA REST                       | DM1 (LOCAL)          | STOPPED           |
| DM Repository                  | DM1 (LOCAL)          | RUNNING           |
| DM Sync Monitor                | DM1 (LOCAL)          | STOPPED           |
| DM Monitoring Service          | DM3                  | STOPPED           |
| DM Agent                       | DM1 (LOCAL)          | RUNNING           |
| DM Agent                       | DM2                  | RUNNING           |
-----------------------------------------------------------------------------
|                         SECONDARY CLUSTER (ACTIVE)                        |
-----------------------------------------------------------------------------
| COMPONENT                      | HOST NAME            | STATUS            |
-----------------------------------------------------------------------------
| DM Daemon                      | DM2                  | RUNNING           |
| ActiveMQ                       | DM2                  | RUNNING           |
| DM REST Service                | DM2                  | RUNNING           |
| Cloud Staging Service          | DM2                  | RUNNING           |
| DSC                            | DM2                  | RUNNING           |
| DSA REST                       | DM2                  | RUNNING           |
| DM Repository                  | DM2                  | RUNNING           |
| DM Sync Monitor                | DM2                  | STOPPED           |
| DM Monitoring Service          | DM4                  | RUNNING           |
| DM Agent                       | DM1 (LOCAL)          | RUNNING           |
| DM Agent                       | DM2                  | RUNNING           |
-----------------------------------------------------------------------------

Cluster Mode:  The Primary Cluster is in 'Standby Mode'
WARNING:  Data Mover will not do failover in 'Standby Mode'.  Please run 'dmcluster switchback' on primary DM server to go back to 'Active Mode' as soon as possible.
STATUS completed successfully.

The Data Mover cluster runs in a downgraded state when in secondary more. After failover, the sync monitor stops running and the synchronization service from the primary to secondary repository is disabled. Since an additional failover cannot occur, it is important to switch the cluster back to primary mode as soon as possible. For instructions on switching from standby back to primary mode, see Switching Back to the Primary Daemon.