Why is it taking a long time to replicate Amazon S3 objects using Cross-Region Replication between my buckets?

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I'm using Cross-Region Replication between two Amazon Simple Storage Service (Amazon S3) buckets in different AWS Regions. I want to know why object replication is taking longer than expected.

Resolution

Cross-Region Replication is an asynchronous process, but the objects are eventually replicated. Most objects replicate within 15 minutes, but sometimes replication can take a couple hours or more. Several factors affect replication time, including:

  • The size of the objects to replicate.
  • The number of objects to replicate. For example, if Amazon S3 is replicating more than 3,500 objects per second, then there might be latency while the destination bucket scales up for the request rate.

Check the replication status on your source object. If the object replication status is PENDING, then Amazon S3 hasn't completed the replication.

Note: To monitor replication metrics, such as the maximum replication time to the destination bucket, turn on S3 Replication Time Control (S3 RTC).

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