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**To modify a replication group** The following ``modify-replication-group`` example modifies the settings for the specified replication group. For Redis (cluster mode enabled) clusters, this operation cannot be used to change a cluster's node type or engine version. :: aws elasticache modify-replication-group / --replication-group-id "my cluster" / --replication-group-description "my cluster" / --preferred-maintenance-window sun:23:00-mon:01:30 / --notification-topic-arn arn:aws:sns:us-west-2:xxxxxxxxxxxxxx52:My_Topic Output:: { "ReplicationGroup": { "ReplicationGroupId": "mycluster", "Description": "mycluster", "Status": "available", "PendingModifiedValues": {}, "MemberClusters": [ "mycluster-0001-001", "mycluster-0001-002", "mycluster-0001-003", "mycluster-0003-001", "mycluster-0003-002", "mycluster-0003-003", "mycluster-0004-001", "mycluster-0004-002", "mycluster-0004-003" ], "NodeGroups": [ { "NodeGroupId": "0001", "Status": "available", "Slots": "0-1767,3134-5461,6827-8191", "NodeGroupMembers": [ { "CacheClusterId": "mycluster-0001-001", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2b" }, { "CacheClusterId": "mycluster-0001-002", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2a" }, { "CacheClusterId": "mycluster-0001-003", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2c" } ] }, { "NodeGroupId": "0003", "Status": "available", "Slots": "5462-6826,10923-11075,12441-16383", "NodeGroupMembers": [ { "CacheClusterId": "mycluster-0003-001", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2c" }, { "CacheClusterId": "mycluster-0003-002", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2b" }, { "CacheClusterId": "mycluster-0003-003", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2a" } ] }, { "NodeGroupId": "0004", "Status": "available", "Slots": "1768-3133,8192-10922,11076-12440", "NodeGroupMembers": [ { "CacheClusterId": "mycluster-0004-001", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2b" }, { "CacheClusterId": "mycluster-0004-002", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2a" }, { "CacheClusterId": "mycluster-0004-003", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2c" } ] } ], "AutomaticFailover": "enabled", "ConfigurationEndpoint": { "Address": "mycluster.xxxxxx.clustercfg.usw2.cache.amazonaws.com", "Port": 6379 }, "SnapshotRetentionLimit": 1, "SnapshotWindow": "13:00-14:00", "ClusterEnabled": true, "CacheNodeType": "cache.r5.large", "TransitEncryptionEnabled": false, "AtRestEncryptionEnabled": false } } For more information, see `Modifying a Replication Group <https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/Replication.Modify.html`>__ in the *Elasticache User Guide*.