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**To increase replica count** The following ``increase-replica-count`` example does one of two things. It can dynamically increase the number of replicas in a Redis (cluster mode disabled) replication group. Or it can dynamically increase the number of replica nodes in one or more node groups (shards) of a Redis (cluster mode enabled) replication group. This operation is performed with no cluster downtime. :: aws elasticache increase-replica-count \ --replication-group-id "my-cluster" \ --apply-immediately \ --new-replica-count 3 Output:: { "ReplicationGroup": { "ReplicationGroupId": "my-cluster", "Description": " ", "Status": "modifying", "PendingModifiedValues": {}, "MemberClusters": [ "my-cluster-001", "my-cluster-002", "my-cluster-003", "my-cluster-004" ], "NodeGroups": [ { "NodeGroupId": "0001", "Status": "modifying", "PrimaryEndpoint": { "Address": "my-cluster.xxxxxih.ng.0001.usw2.cache.amazonaws.com", "Port": 6379 }, "ReaderEndpoint": { "Address": "my-cluster-ro.xxxxxxih.ng.0001.usw2.cache.amazonaws.com", "Port": 6379 }, "NodeGroupMembers": [ { "CacheClusterId": "my-cluster-001", "CacheNodeId": "0001", "ReadEndpoint": { "Address": "my-cluster-001.xxxxxih.0001.usw2.cache.amazonaws.com", "Port": 6379 }, "PreferredAvailabilityZone": "us-west-2a", "CurrentRole": "primary" }, { "CacheClusterId": "my-cluster-003", "CacheNodeId": "0001", "ReadEndpoint": { "Address": "my-cluster-003.xxxxxih.0001.usw2.cache.amazonaws.com", "Port": 6379 }, "PreferredAvailabilityZone": "us-west-2a", "CurrentRole": "replica" } ] } ], "AutomaticFailover": "disabled", "SnapshotRetentionLimit": 0, "SnapshotWindow": "07:30-08:30", "ClusterEnabled": false, "CacheNodeType": "cache.r5.xlarge", "TransitEncryptionEnabled": false, "AtRestEncryptionEnabled": false } } For more information, see `Increasing the Number of Replicas in a Shard <https://docs.aws.amazon.c`m/AmazonElastiCache/latest/red-ug/increase-replica-count.html>`__ in the *Elasticache User Guide*.