Creating a Migration Task

Scenario

If there is less than 3 TB of data or less than 5 million objects in a source bucket, you can create a migration task to quickly migrate the source data.

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 migrate the source data quickly.

Prerequisites

• You have registered a HUAWEI ID and enabled Huawei Cloud services.
• You have prepared a URL list and uploaded it to OBS. The URLs in the list can be accessed using HEAD and GET requests.
  

  If the URLs cannot be accessed using HEAD and GET requests, they cannot be migrated by OMS over HTTP or HTTPS. If you still want to use OMS, you are advised to migrate the data from the bucket. Alternatively, contact OBS support.

• You have obtained the AK/SK pairs and required permissions for the destination platform account.
  • The destination platform account needs the permissions required to list buckets, obtain bucket locations, list objects, obtain object metadata, obtain object content, upload objects, list uploaded parts, and restore archive objects. For details about how to obtain these permissions, see Destination Permissions.
• You have created a bucket in OBS.
• You have created less than 1,000,000 migration tasks within the past 24 hours.
• You have less than 1,000,000 migration tasks in Waiting state.

Procedure

1. Log in to the Huawei Cloud console.
2. Click in the upper left corner and select the region where the destination bucket is located from the drop-down list.
   Figure 1 Selecting the region where the destination bucket is located
   

3. Click Service List in the upper left corner, and choose Migration > Object Storage Migration Service.
   You can also enter OMS in the search box to quickly find OMS.

   Figure 2 Choosing OMS
   

4. On the Migration Tasks page, click Create Migration Task in the upper right corner.
   Figure 3 Creating a migration task
   

5. Read the service disclaimer, select I have read and agree to the service disclaimer, and click OK. The Create Migration Task page is displayed.
   Figure 4 Select Source/Destination
   

6. In the Select Source area, select HTTP/HTTPS data sources for Data Source.
7. Set parameters in the Select Destination area and click Next. For details, see Table 1.

   Table 1 Parameters for configuring a destination bucket

   Parameter	Configuration
   Access Key ID	Enter the AK for the Huawei Cloud account to which the destination bucket belongs.
   Secret Access Key	Enter the SK for the Huawei Cloud account to which the destination bucket belongs.
   Bucket	Select a destination OBS bucket for storing the migrated data.

8. On the displayed Set Task Parameters page, configure the task parameters.
   Figure 5 Setting task parameters
   

9. Select URL List.
   1. Under URL List Bucket (Huawei Cloud), select the OBS bucket where the URL list is stored.
      

      The bucket used for storing the URL list must be in the same region as the destination bucket, or you cannot select this list.

   2. Click Select next to Select a URL List File. In the displayed dialog box, select the URL list and click OK.
      

      Ensure that the URLs in the lists can be accessed using HEAD and GET requests.

10. Configure parameters in the Destination Configuration area.
    1. Specify Prefix
       • If you choose to disable this feature, the names of objects remain unchanged before and after the migration.
       • If choose to enable this feature, you can specify a prefix to rename or redefine the paths for objects migrated to the destination bucket.
         Figure 6 Entering a prefix
         
         

         To learn how to use Specify Prefix, see Adding a Name Prefix or Path Prefix to Migrated Objects.

    2. Object Storage Class

       Choose the storage class that your data will be migrated to. For details about storage classes, see Storage Classes.

11. Click on the left of Advanced Settings to expand advanced options, as shown in Figure 7. Set parameters in Advanced Settings based on Table 2.
    Figure 7 Advanced settings
    

    Table 2 Advanced settings

    Parameter	Configuration
    Object Metadata	Determine whether to migrate metadata. If you select Do not migrate, OMS will only migrate the Content-Type and Content-Encoding metadata. If you select Migrate, OMS will migrate supported metadata. NOTICE: Only Chinese characters, English characters, digits, and hyphens (-) can be migrated. Other characters cannot be migrated. Even if you choose not to migrate metadata, the Content-Type and Content-Encoding metadata will still be migrated to ensure that the migration runs properly.
    Selective Migration	Determine whether to filter source data to be migrated by time. If you do not need to filter source data by time, disable this option. If you need to filter source data by time, enable this option and specify a date and time. Then only source data modified after the specified date and time will be migrated.
    Server-Side Encryption	Determine whether to enable server-side encryption. If you choose to disable this option, objects will not be encrypted before they are stored to the destination bucket. If you choose to enable this option, objects will be encrypted before they are stored to the destination bucket. NOTE: SSE-KMS is used by default. Other encryption methods or custom encryption is not supported. If the destination is a parallel file system (PFS), KMS encryption is not supported. Enabling KMS-based server-side encryption may slow down the migration speed by about 10%. KMS encryption is only available if KMS is supported in the region you are migrating to.
    Failed Object Record	Determine whether to record the objects that fail to be migrated. If you choose to disable this option, the system will not record the objects that fail to be migrated. If the migration fails and needs to be retried, all objects in the source bucket need to be migrated again. If you choose to enable this option, the system will record the objects that fail to be migrated. If the migration fails and needs to be retried, you can choose to only migrate failed objects again. NOTE: For a migration task, no matter it is contained in a task group or not, the objects that fail to be migrated are recorded in a list named after the task name, and the list is uploaded to the oms/failed_object_lists/ directory of the destination bucket. A maximum of 100,000 failed objects can be recorded in the failed object list. If more than 100,000 objects fail to be migrated in the migration task, you are advised to rectify the fault based on the existing failed object list and perform the migration again. This file contains information about the failed migration task, including the failure cause and time (in local UTC), URL-encoded names of failed objects, non-URL-encoded names of failed objects, and error codes returned by source SDKs. This file is retained in the destination bucket even after the objects in the file are successfully re-transferred. If you do not need the file, delete it manually.
    Archive Data Restoration	Archived data must be restored before it can be migrated. You can choose to enable this option if your source cloud service provider supports automatic restoration of archived data. If you enable this option, the system automatically restores and migrates archived objects in the migration task. If an archive object fails to be restored, the system skips it and records it in the list of objects that failed to be migrated and continues to migrate other objects in the migration task. NOTICE: The following cloud service providers can automatically restore archived objects: Huawei Cloud, Alibaba Cloud, Kingsoft Cloud, and Tencent Cloud. It takes at least a minute to restore an archived object. The larger the archived object is, the longer it takes to restore it, but if an archived object cannot be restored within three minutes, the restoration fails. The time needed depends on the cloud service provider. For details, see the documentation of your source cloud service provider. Two types of fees are generated during archived data restoration: fees for API calls and fees for archived object restoration. These fees are billed by the source cloud service provider. After the restoration is complete, archived objects will be in restored state for a certain period of time. During this period, objects can be downloaded or read. After this period expires, archived objects need to be restored again for migration. For details about how long they stay in the restored state, see the documentation of the cloud service provider. The copies generated for restoring archived objects will be stored for three days by default. If there is more than 3 TB of data or more than 3 million objects in a source bucket, create a migration task group to migrate data in case the migration fails because the restored data is archived again. Pausing or restarting a migration task will result in restoration of all archive data again, no matter it has been restored or not. After objects are migrated from the source platform to Huawei Cloud, they are in the same storage class as the destination bucket. If you do not enable this option, the system directly records archived objects in the list of objects that failed to be migrated, skips them, and continues to migrate other objects in the migration task.
    SMN Notification	Decide whether to use SMN to get notifications about migration results. If you do not enable this option, no SMN message will be sent after the migration is complete. If you enable this option, you will receive an SMN message informing you of the migration results. Perform the following steps: Click Add next to the SMN Topic box. The Select SMN Topic dialog box is displayed. Select a topic for publishing SMN messages and click OK. If OMS is not authorized to publish messages to the selected SMN topic, a Warning dialog box will appear after you click OK. If you need to complete the authorization, click OK to authorize OMS. Otherwise, click Cancel to return to the Select SMN Topic page and select another SMN topic. Click Add next to the SMN Template box. The Select SMN Template dialog box is displayed. If this parameter is specified, SMN messages will be sent using the specified template. The template must use the default protocol. Select a template for publishing SMN messages and click OK. Configure Trigger Condition. You can select one of the following options or both: Migration succeeded: An SMN message will be sent if the migration task succeeds. Migration failed: An SMN message will be sent if the migration task fails. NOTE: If you experience trouble in using SMN, see What Do I Do If SMN Does Not Work Properly?
    Traffic Limiting	Set the maximum bandwidth for the migration task during different periods. If you do not need to limit the migration traffic, disable this option. If you need to limit the migration traffic, enable this option. Perform the following steps: Specify Start Time, End Time, and Maximum Bandwidth. The maximum bandwidth ranges from 1 MB/s to 200 MB/s. NOTICE: For example, if you set Start Time to 08:00, End Time to 12:00, and Maximum Bandwidth to 20 MB/s, the maximum migration speed is limited to 20 MB/s when the migration task runs in the period from 08:00 to 12:00. The migration speed is not limited beyond this period. The time is the local standard time of the region you are migrating to. Click Add Rule. An empty traffic limiting rule is displayed. Repeat 1 and 2 to add another traffic limiting rule. You can click Delete in the Operation column to delete a rule. NOTE: A maximum of five rules can be added for a migration task. You can set traffic limiting rules in the task details even after the task is created.
    Object Overwrite	Overwrite if source newer or different size: If a source object is not as large as or was last modified more recently than its paired destination object, the source object will overwrite the destination object. Otherwise, the source object will be skipped. Never overwrite: The system will always skip source objects and keeps their paired destination objects. Overwrite if different CRC64 checksum: If a source object has a CRC64 checksum different from the paired destination object, the source object will overwrite the destination object. Otherwise, the source object will be skipped. If either of them does not have a CRC64 checksum, their sizes and last modification times are checked. NOTE: This option is only available for migration on Huawei Cloud or from Alibaba Cloud or Tencent Cloud. This option is applied only when the source object has a same encryption attribute as the destination one. Always overwrite: The system always allows source objects to overwrite their paired destination objects.
    Consistency Check	By size and last modification time: With this default setting, the system will check object consistency with object size and last modification time. By CRC64 checksum: The system will check object consistency with CRC64 checksums. If a source object and the paired destination object have CRC64 checksums, the checksums are checked. Otherwise, their sizes and last modification times are checked.
    Priority	If there are a large number of tasks, you can set task priorities to control which tasks take precedence over other tasks.
    Description	In the Description area, enter a maximum of 255 characters to briefly describe the migration task.

12. Click Next to enter the confirmation page.
13. Confirm the source information, destination information, task parameters, and advanced settings, and click Next. A message is displayed, indicating that the migration task is successfully created. The migration task is displayed in the migration task list.
    

    After the task is created, a task ID is generated for quick identification. It is displayed in the upper left corner of the task list. It is composed of the source bucket name, destination bucket name, and time sequence ID.

Related Operations

You can perform the following operations on a created migration task.