### Group Management Service

The Group Management Service (GMS) is an infrastructure component that is enabled for the instances in a cluster. When GMS is enabled, if a clustered instance fails, the cluster and the Domain Administration Server (DAS) are notified of the failure and can respond to the failure. The following features depend on GMS:

- IIOP failover

- In-memory replication

- Transaction service

- Timer service

For information about using GMS, see the following topics:

- To Configure GMS

- To Enable GMS for a Cluster