Restoring Objects from the Cold Storage

You must restore a Cold object before you can operate it, including download, access using a URL, as well as ACL and metadata settings.

Limitations and Constraints

  • You cannot suspend or delete the restore task if a Cold object is being restored.

  • You cannot re-restore an object in the Restoring state.

  • After an object is restored, an object copy in the Standard storage class will be generated. This way, there is the object in Cold storage class and also its copy in Standard storage class in the bucket. The copy will be automatically deleted once the restore expires.


  1. In the bucket list, click the bucket you want to operate. The Overview page is displayed.

  2. In the navigation pane, choose Objects.

  3. Select the file you want to restore, and click Restore on the right. The following dialog box shown in Figure 1 is displayed.

    You can select multiple files and click Restore above the file list to batch restore the files.


    Objects that are being restored cannot be added for batch restore.

    **Figure 1** Restoring an object

    Figure 1 Restoring an object

  4. Configure the validity period and speed of the restore. The following table describes the parameters.

    Table 1 Parameters for restoring objects



    Validity Period

    How long the object will remain in the Restored state. It starts once the object is restored. The value is an integer ranging from 1 to 30 (days). The default value is 30.

    For example, if you set Validity Period to 20 when restoring an object, 20 days after the object is successfully restored, its status will change from Restored to Unrestored.


    How fast an object will be restored.

    • Expedited: Cold objects can be restored within 1 to 5 minutes.

    • Standard: Cold objects can be restored within 3 to 5 hours.

    • Bulk: Large amounts, even gigabytes, of data can be restored within 5 to 12 hours at a low cost.

  5. Click OK.

    The Restoration Status column in the object list displays the restore statuses of objects.

    You can click image1 to manually refresh the restore status.


    The system checks the file restore status at UTC 00:00 every day. The system starts counting down the expiration time from the time when the latest check is complete.