Backup and Disaster Recovery Parameters

cluster_id

Parameter description: Specifies the cluster ID recorded in the primary cluster for fine-grained DR. In other scenarios, this parameter is left blank. This parameter is supported only by clusters 8.2.0.100 or later. It is an internal DR parameter and does not need to be modified.

Type: SIGHUP

Value range: a string. By default, this parameter is left blank. If this parameter is set, the value is in UUID format.

Default value: empty

fine_disaster_main_clusters

Parameter description: Specifies the list of primary cluster IDs recorded in the primary cluster for fine-grained DR. This parameter is supported only by clusters 8.2.0.100 or later. It is an internal DR parameter and does not need to be modified.

Type: SIGHUP

Value range: a string. By default, this parameter is left blank. If this parameter is set, the list unit is in UUID format. If there are multiple units, separate them with commas (,).

Default value: empty

enable_metadata_tracking

Parameter description: In the primary cluster for fine-grained DR, this parameter is used to track metadata (including DDL and DCL) changes of objects related to fine-grained DR and synchronize changed metadata to the standby cluster. This parameter is supported only by clusters of version 8.2.1 or later.

Type: SIGHUP

Value range: Boolean

• on indicates that the metadata change tracking function is enabled. Metadata changes can be synchronized to the standby cluster through fine-grained DR.
• off indicates that the metadata change tracking function is disabled.

Default value: off

disaster_cluster_dn_nums

Parameter description: number of DNs in the primary/standby cluster for fine-grained DR, in the format of Number of DNs in the local cluster,Number of databases in the remote cluster. This parameter is used for data bucketing during synchronization from a small cluster to a large cluster. This parameter is supported only by clusters of version 8.2.1 or later.

Type: SIGHUP

Value range: a string. Set this parameter based on DNs in the primary and standby clusters. For example, if the ratio of DNs is 6:3, set this parameter to 6,3 and 3,6 for large and small clusters, respectively.

Default value: 0, 0

fine_dr_consistency_check_mode

Parameter description: Determines how data consistency is checked between the primary and standby clusters for fine-grained DR. The consistency check can only be done when the primary and standby clusters are in sync. This parameter is available only for clusters of version 8.2.1.251 or later.

Type: USERSET

Value range: enumerated values

• none means that no data consistency check is performed.
• warning indicates that warning logs are printed if the data on the active and standby nodes is inconsistent.
• error indicates that an error message is returned if the data of the active and standby clusters is inconsistent.

Default value: none