amazon Replication: Redis (Cluster Mode Disabled) vs. Redis (Cluster Mode Enabled)
Beginning with Redis version 3.2, you have the ability to create one of two distinct types of Redis clusters (API/CLI: replication groups). A Redis (cluster mode disabled) cluster always has a single shard (API/CLI: node group) with up to 5 read replica nodes. A Redis (cluster mode enabled) cluster has up to 90 shards with 1 to 5 read replica nodes in each.
Redis (cluster mode disabled) and Redis (cluster mode enabled) clusters
The following table summarizes important differences between Redis (cluster mode disabled) and Redis (cluster mode enabled) clusters.
Comparing Redis (Cluster Mode Disabled) and Redis (Cluster Mode Enabled) Clusters
| Feature | Redis (cluster mode disabled) | Redis (cluster mode enabled) |
|---|---|---|
| Modifiable | Yes. Supports adding and deleting replica nodes, and scaling up node type. | Limited. For more information, see Upgrading Engine Versions and Scaling Clusters in Redis (Cluster Mode Enabled). |
| Data Partitioning | No | Yes |
| Shards | 1 | 1 to 90 |
| Read replicas | 0 to 5 Important If you have no replicas and the node fails, you experience total data loss. | 0 to 5 per shard. Important If you have no replicas and a node fails, you experience loss of all data in that shard. |
| Multi-AZ with Automatic Failover | Yes, with at least 1 replica. Optional. On by default. | Yes. Required. |
| Snapshots (Backups) | Yes, creating a single .rdb file. | Yes, creating a unique .rdb file for each shard. |
| Restore | Yes, using a single .rdb file from a Redis (cluster mode disabled) cluster. | Yes, using .rdb files from either a Redis (cluster mode disabled) or a Redis (cluster mode enabled) cluster. |
| Supported by | All Redis versions | Redis 3.2 and following |
| Engine upgradeable | Yes, with some limits. For more information, see Upgrading Engine Versions. | Yes, with some limits. For more information, see Upgrading Engine Versions. |
| Encryption | Versions 3.2.6 and 4.0.10 and later. | Versions 3.2.6 and 4.0.10 and later. |
| HIPAA Compliant | Version 3.2.6 and 4.0.10 and later. | Version 3.2.6 and 4.0.10 and later. |
| PCI DSS Compliant | Version 3.2.6 and 4.0.10 and later. | Version 3.2.6 and 4.0.10 and later. |
| Online resharding | N/A | Version 3.2.10 and later. |