Redis tier capabilities

This page describes the differences between the available Redis tiers.

Memorystore for Redis supports Basic and Standard Tiers. The Basic Tier is best suited for applications that use Redis as a cache and can withstand a cold restart and full cache flush. Standard Tier instances provide High Availability using replication, read replicas, and automatic failover.

It is not possible to upgrade from Basic Tier to Standard Tier or the other way around. If you want to move data from an existing Basic Tier instance to a new Standard Tier instance, use import and export to move your data.

Tier architecture

The following diagrams show the architectures for the Memorystore for Redis service tiers.

Basic Tier

  • One Redis node
  • Ephemeral cache

Standard Tier

  • Provides High Availability with replication
  • Fails over to replica in the case of primary node failure

Standard Tier with read replicas

  • Provides High Availability with replication
  • Read replicas allow for distributed reads

Feature comparison

Specifications Basic Tier Standard Tier (read replicas disabled) Standard Tier (read replicas enabled)
Description Provides a cache with no replication Provides redundancy and availability using replication Provides redundancy and availability using replication to backup data, and multiple Read replicas to increase read throughput
Max Redis primary size 300 GB 300 GB 300 GB
Max network bandwidth 16 Gbps 16 Gbps 16 Gbps total for writes. 16 Gbps per node for reads.1
I/O threads Yes2 Yes2 Yes2
Scale primary size Yes Yes Yes
Scale number of read replicas No No Yes
Cross-zone replication No Yes Yes
Automatic failover No Yes Yes
Read replicas No No Yes
In-transit encryption Yes Yes Yes
Maintenance window Yes Yes Yes
Cloud Monitoring Yes Yes Yes

1 The maximum write throughput is 16 Gbps. Read throughput is dependent on the number of nodes (read replicas) in the instance, including the primary node. For example, if you have an instance with 1 primary node and 2 read replicas, the total read throughput is 48 Gbps.

2 I/O threads are only available on M3 instances or higher running Redis version 6.x. For more information, see Redis version 6.x.