### 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 of Application Server 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