Answer: All the nodes in a Redis cluster must reside in the same region, While using Redis with cluster mode enabled, you cannot manually promote any of the replica nodes to primary

All the nodes in a Redis cluster must reside in the same region All the nodes in a Redis cluster (cluster mode enabled or cluster mode disabled) must reside in the same region. While using Redis with cluster mode enabled, you cannot manually promote any of the replica nodes to primary While using Redis with cluster mode enabled, there are some limitations: You cannot manually promote any of the replica nodes to primary. Multi-AZ is required. You can only change the structure of a cluster, the node type, and the number of nodes by restoring from a backup. Incorrect options: While using Redis with cluster mode enabled, asynchronous replication mechanisms are used to keep the read replicas synchronized with the primary. If cluster mode is disabled, the replication mechanism is done synchronously - When you add a read replica to a cluster, all of the data from the primary is copied to the new node. From that point on, whenever data is written to the primary, the changes are asynchronously propagated to all the read replicas, for both the Redis offerings (cluster mode enabled or cluster mode disabled). If you have no replicas and a node fails, you experience no loss of data when using Redis with cluster mode enabled - If you have no replicas and a node fails, you experience loss of all data in that node's shard, when using Redis with cluster mode enabled. If you have no replicas and the node fails, you experience total data loss in Redis with cluster mode disabled. You can scale write capacity for Redis by adding replica nodes - This increases only the read capacity of the Redis cluster, write capacity is not enhanced by read replicas.

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