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modify-replication-group-shard-configuration.rst
**To modify a replication group shard configuration** The following ``modify-replication-group-shard-configuration`` decreases the node group count using the Redis engine. :: aws elasticache modify-replication-group-shard-configuration \ --replication-group-id mycluster \ --node-group-count 3 \ --apply-immediately \ --node-groups-to-remove 0002 Output :: { "ReplicationGroup": { "ReplicationGroupId": "mycluster", "Description": "mycluster", "GlobalReplicationGroupInfo": {}, "Status": "modifying", "PendingModifiedValues": {}, "MemberClusters": [ "mycluster-0002-001", "mycluster-0002-002", "mycluster-0002-003", "mycluster-0003-001", "mycluster-0003-002", "mycluster-0003-003", "mycluster-0003-004", "mycluster-0004-001", "mycluster-0004-002", "mycluster-0004-003", "mycluster-0005-001", "mycluster-0005-002", "mycluster-0005-003" ], "NodeGroups": [ { "NodeGroupId": "0002", "Status": "modifying", "Slots": "894-1767,3134-4443,5149-5461,6827-7332,12570-13662", "NodeGroupMembers": [ { "CacheClusterId": "mycluster-0002-001", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2c" }, { "CacheClusterId": "mycluster-0002-002", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2a" }, { "CacheClusterId": "mycluster-0002-003", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2b" } ] }, { "NodeGroupId": "0003", "Status": "modifying", "Slots": "0-324,5462-5692,6784-6826,7698-8191,10923-11075,12441-12569,13663-16383", "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" }, { "CacheClusterId": "mycluster-0003-004", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2c" } ] }, { "NodeGroupId": "0004", "Status": "modifying", "Slots": "325-336,4706-5148,7333-7697,9012-10922,11076-12440", "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" } ] }, { "NodeGroupId": "0005", "Status": "modifying", "Slots": "337-893,1768-3133,4444-4705,5693-6783,8192-9011", "NodeGroupMembers": [ { "CacheClusterId": "mycluster-0005-001", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2a" }, { "CacheClusterId": "mycluster-0005-002", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2c" }, { "CacheClusterId": "mycluster-0005-003", "CacheNodeId": "0001", "PreferredAvailabilityZone": "us-west-2b" } ] } ], "AutomaticFailover": "enabled", "MultiAZ": "enabled", "ConfigurationEndpoint": { "Address": "mycluster.g2xbih.clustercfg.usw2.cache.amazonaws.com", "Port": 6379 }, "SnapshotRetentionLimit": 1, "SnapshotWindow": "13:00-14:00", "ClusterEnabled": true, "CacheNodeType": "cache.r5.xlarge", "TransitEncryptionEnabled": false, "AtRestEncryptionEnabled": false } } For more information, see `Scaling ElastiCache for Redis Clusters <https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/Scaling.html>`__ in the *Elasticache User Guide*.