# AWS lets existing ElastiCache Valkey clusters change durability

_Published Tuesday, October 27, 2026 at 6:32 PM EDT · Infrastructure · Latest · Tier 2 — Notable_

Amazon Web Services says ElastiCache for Valkey customers can now enable or disable durability on existing node-based clusters without creating a replacement. Previously, customers could not change that configuration in place, complicating moves between caching and persistent storage.

Synchronous writes persist data across at least two availability zones before responding, with single-digit millisecond write latency and a design goal of zero data loss. Asynchronous writes preserve microsecond write latency at no additional cost, but a failure could lose up to 10 seconds of uncommitted data. Both retain microsecond read latency. The feature is available wherever ElastiCache for Valkey 9.0 and later is offered.

## Sources

- [Recent Announcements](https://aws.amazon.com/about-aws/whats-new/2026/10/elasticache-changing-durability/)

---
Canonical: https://techandbusiness.org/newswire/r-T9N7tUEaoTgSqah95qVC
Published: 2026-10-27T22:32:23.697Z
Story chronology: 2026-10-27T15:21:00.000Z
Retrieved: 2026-10-28T01:07:55.598Z
Publisher: Tech & Business (techandbusiness.org)