About global clusters
Global cluster technology is a central feature of high availability disaster recovery (HA/DR). Part of HA/DR uses objects called global clusters and global service groups to achieve remote, cross-cluster failover. Global clusters and global service groups have corresponding remote clusters and remote service groups configured at a distant geographic location.
Table: Global cluster objects describes the objects in a global cluster.
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Table: Global cluster objects
| Object | Description |
|---|---|
| Global cluster | A global cluster contains at least one remote cluster. |
| Global service group | A global service group is a service group that has been configured on one or more remote clusters. |
| Remote cluster | A remote cluster is a cluster that is specifically configured as a failover target for a global service group. The local cluster heartbeats with this cluster. |
If failover within the local cluster is not possible, a global service group fails over to its preconfigured remote cluster.
Note: Remote clusters are usually configured far away from their corresponding global clusters.
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