Amazon ElastiCache
User Guide (API Version 2015-02-02)

Maintenance Window

Every cluster has a weekly maintenance window during which any system changes are applied. If you don't specify a preferred maintenance window when you create or modify a cache cluster, ElastiCache assigns a 60-minute maintenance window within your region's maintenance window on a randomly chosen day of the week.

The 60-minute maintenance window is chosen at random from an 8-hour block of time per region. The following table lists the time blocks for each region from which the default maintenance windows are assigned. You may choose a preferred maintenance window outside the region's maintenance window block.

Region Code Region Name Region Maintenance Window
ap-northeast-1 Asia Pacific (Tokyo) Region 13:00–21:00 UTC
ap-south-1 Asia Pacific (Mumbai) Region 17:30–1:30 UTC
ap-southeast-1 Asia Pacific (Singapore) Region 14:00–22:00 UTC
ap-southeast-2 Asia Pacific (Sydney) Region 12:00–20:00 UTC
cn-north-1 China (Beijing) region 14:00–22:00 UTC
eu-central-1 EU (Frankfurt) Region 23:00–07:00 UTC
eu-west-1 EU (Ireland) Region 22:00–06:00 UTC
sa-east-1 South America (São Paulo) Region 01:00–09:00 UTC
us-east-1 US East (N. Virginia) Region 03:00–11:00 UTC
us-east-2 US East (Ohio) Region 04:00–12:00 UTC
us-gov-west-1 AWS GovCloud (US) region 06:00–14:00 UTC
us-west-1 US West (N. California) Region 06:00–14:00 UTC
us-west-2 US West (Oregon) Region 06:00–14:00 UTC

The maintenance window should fall at the time of lowest usage and thus might need modification from time to time. You can specify a time range of up to 24 hours in duration during which any maintenance activities you have requested should occur. Any deferred or pending cluster modifications you requested occur during this time.

For more information about how to adjust the preferred maintenance window for your cache clusters, see Modifying an ElastiCache Cluster or Modifying a Cluster with Replicas.