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 data 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

Data preservation

The following list shows how data is preserved during various operations and failure modes for Basic Tier instances:

Event Data is preserved
Maintenance update Yes1
Scaling instance size Yes1
Version upgrade Yes1
Unexpected instance failure No
  1. Maintenance, scaling, and version upgrades require additional memory overhead. To configure the optimal overhead, see Memory intensive operations.

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 node size 300 GB 300 GB 100 GB
Max network bandwidth 16 Gbps 16 Gbps 16 Gbps
I/O threads Yes1 Yes1 Yes1
Scale node size Yes Yes Yes
Scale number of read replica nodes 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 I/O threads are only available on M3 instances or higher running Redis version 6.x. For more information, see Redis version 6.x.