Scenarios
When you migrate full backups from self-built OBS buckets to clouds, the following error message is displayed: restore:null.
Possible Causes
The possible causes are as follows:
- Backup files are deleted after you submit a backup migration task.
- When you upload backup files to a self-built OBS bucket, you select Archive for Storage Class. OBS archive storage offers cloud storage for rarely accessed data. An archive file uploaded for the first time is in the Not restored status. As a result, a Microsoft SQL Server DB instance cannot download the file.
Solutions
Based on the previous analysis, solutions are provided as follows:
Solution 1
If the migration fails because you delete the backup files, you can upload the deleted backup files again to a self-built OBS bucket and select Standard for Storage Class. For details, see Uploading a File in Object Storage Service Console Operation Guide.
Solution 2
- If the migration failed because the storage class of your backup files is Archive, perform the following steps. If the size of backup files is small, upload the backup files again to an OBS bucket and select Standard for Storage Class.
- If the backup files are large in size, log in to the OBS console and click the bucket to which the backup files are uploaded. On the displayed page, choose Objects in the navigation pane on the left. On the Objects page, select the object to be restored and click Restore above the file list. After the status of the backup files becomes Restored, submit an offline migration task again.