Announcing durability for Amazon ElastiCache for Valkey

This article announces durability for Amazon ElastiCache for Valkey, enabling data protection for persistent workloads while maintaining microsecond latency.

• Synchronous writes: Zero data loss, single-digit millisecond write latency, cross-AZ persistence
• Asynchronous writes: Up to 10 seconds potential data loss, microsecond write latency, no additional cost
• Multi-AZ transactional log provides fast recovery during infrastructure failures
• Read latency remains microseconds under both durability options
• Synchronous writes ideal for RAG knowledge bases, AI agent memory, payment tokenization
• Asynchronous writes suitable for session stores, leaderboards, real-time analytics
• Performance testing shows negligible latency impact with asynchronous writes
• Available in all AWS regions starting with Valkey 9.0

ElastiCache durability enables use as both cache and persistent data store, with flexible options balancing data protection against latency requirements.