Help Center/ Object Storage Migration Service/ User Guide/ Migration Task Groups/ Migration Task Group Overview
Updated on 2025-12-02 GMT+08:00
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Migration Task Group Overview

If there is more than 3 TB of data or more than 5 million objects to migrate in a source bucket, you can create a migration task group to transfer the data quickly. The system will group the source objects into multiple sub-tasks for concurrent migrations.

  • By default, if a task stays in a waiting state for more than 30 days, OMS automatically puts the task into a Failed state and clears the AK/SK pair used by the task. To prevent task failures caused by blocking, do not create tasks too frequently.
  • If an object is larger than 500 GB, migrating it takes a long time. You can submit a service ticket to whitelist the object for migration in segments.
  • During the migration, the system automatically creates a temporary folder named OMS in the destination bucket. Do not perform any operations on this folder, including but not limited to modifying, deleting, or adding data in the folder. Otherwise, the migration will be interrupted or fail.
Parent topic: Migration Task Groups