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Limitations - Amazon ElastiCache

Limitations

  • Durability for ElastiCache is supported on Valkey 9.0 or later.

  • Durability for ElastiCache is supported for the following instance type families: R8g, R7g, R6g, M8g, M7g, M6g, C8gn, and C7gn.

  • Durability is not supported with ElastiCache Serverless.

  • Durability is not supported with Global Datastores, Outposts, Local Zones, or data tiering.

  • Durability enabled clusters support up to 100 MiBps of write throughput per primary node.

  • Durability for ElastiCache is not supported for Cluster Mode Disabled (CMD) clusters.

  • Durability for ElastiCache requires Multi-AZ enabled with at least one replica per shard.

  • Durability requires and automatically enables encryption at-rest.

  • Changing durability on an existing cluster requires encryption in transit (TLS) to be enabled.

  • Online migration from self-hosted Valkey or Redis OSS to a durable cluster is not supported.

  • When durability is enabled and search indexes are configured, write commands targeting indexed keys may be throttled to maintain transactional log performance. For details, see Search write throttling.