Amazon ElastiCache for Valkey introduced the ability to toggle durability on existing node-based clusters, overcoming prior limitations requiring cluster replacement to change durability configurations. Users can select synchronous writes, ensuring cross-AZ persistence with minimal latency and zero data loss targets, or asynchronous writes, prioritizing microsecond latency at some risk of short-term data loss.
This flexibility broadens ElastiCache’s applicability from caching toward persistent data store use cases where data loss is unacceptable, such as AI agent state management, payment tokenization, or real-time inventory. Both durability modes maintain microsecond read latency. The capability is available in all Regions supporting Valkey 9.0 and later.
Source & further reading
Amazon ElastiCache for Valkey now supports changing durability on existing clusters ↗Source published 2026-10-27. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.