This topic describes how to migrate data by using Data Transport.

Precautions

When you perform online migration, take note of the following items:
  • A migration task occupies the network resources of the source and destination data addresses. To ensure business continuity, we recommend that you configure a rate limit for your migration task or run your migration task during off-peak hours.
  • Before an online migration task starts, the system checks the files at the source data address and the destination data address. If the source and destination have files with the same name, and the last modification time of the file in the source is later than the file in the destination, the file in the destination is overwritten. If both files are important and contain different information, we recommend that you change the name of one file or back up the destination file.
  • Data Online Migration allows you to migrate only the data of a single bucket per task. You cannot migrate all data that belongs to your account at a time.

Step 1: Create a source data address

  1. Log on to the Alibaba Cloud Data Transport console.
  2. In the left-side navigation pane, choose Data Online Migration > Data Address. On the page that appears, click Create Data Address.
  3. In the Create Data Address panel, configure the parameters in the following table and click OK.
    Parameter Required Description
    Data Type Yes Select Baidu BOS.
    Data Name Yes Enter a name that is 3 to 63 characters in length. Special characters are not supported, except for hyphens (-) and underscores (_).
    Endpoint Yes Enter an endpoint in the region where the source data address is located.
    You can use one of the following endpoints:
    • http://bj.bcebos.com (Beijing)
    • http://gz.bcebos.com (Guangzhou)
    • http://su.bcebos.com (Suzhou)
    Bucket Yes Enter the name of the Baidu Object Storage (BOS) bucket.

    The bucket name cannot contain invalid characters, such as spaces, line breaks, and tab characters.

    Prefix Yes
    • Migrate All Data: All data in the bucket is migrated.

      If you select this option, you do not need to specify the Prefix parameter.

    • Migrate Partial Data: If you select this option, you must specify the Prefix parameter. Only files whose names are prefixed with the specified characters are migrated. The parameter value cannot start with a forward slash (/) but must end with a forward slash (/). For example, you can set this parameter to docs/.
    Access Key Id Yes Specify the AccessKey pair that is used to migrate data. Delete the key pair after the migration.
    Secret Access Key Yes
  4. Optional:If the system prompts that this feature is in public preview, click Application to apply for using this feature.
  5. Optional:Enter the required information and submit the application for public preview. After the application is approved, the system sends a text message to notify you.

Step 2: Create a destination data address

  1. In the left-side navigation pane, choose Data Online Migration > Data Address. On the page that appears, click Create Data Address.
  2. In the Create Data Address panel, configure the following parameters and click OK.
    Parameter Required Description
    Data Type Yes Select OSS.
    Data Name Yes Enter a name that is 3 to 63 characters in length. Special characters are not supported, except for hyphens (-) and underscores (_).
    Data Region Yes Select the region where the destination data address is located.
    Enable Transfer Acceleration No For Data Online Migration to use the transfer acceleration feature provided by Object Storage Service (OSS), you must enable the transfer acceleration feature for buckets. The transfer acceleration feature takes effect within 30 minutes after it is enabled. After you enable the feature, wait for 30 minutes before you create a migration job.
    Notice If you use the transfer acceleration feature to access your OSS buckets, you are charged additional transfer acceleration fees. For more information, see Transfer acceleration.
    OSS Endpoint Yes
    Select an endpoint in the region where your data is stored. For more information, see Regions and endpoints.
    • http://oss-cn-endpoint.aliyuncs.com: indicates that you use an HTTP-based endpoint to access OSS over the Internet.
    • https://oss-cn-endpoint.aliyuncs.com: indicates that you use an HTTPS-based endpoint to access OSS over the Internet.
    Note When you migrate third-party data to OSS, you must access OSS from an Internet endpoint.
    AccessKey Id Yes Specify the AccessKey pair that is used to migrate data. For more information, see Preparations.
    AccessKey Secret Yes
    OSS Bucket Yes Select a bucket to store the migrated data.
    OSS Prefix No The value cannot start with a forward slash (/) but must end with a forward slash (/). For example, you can specify data/to/oss/ as the OSS prefix. Do not specify this parameter if you want to migrate data to the root directory of the specified bucket.
    Notice If the name of a source file starts with a forward slash (/), you must specify an OSS prefix when you configure the destination data address. If no OSS prefix is specified, the migration job fails. For example, if the name of a file to be migrated is /test/test.png, you must specify an OSS prefix, such as oss/. After the migration job is completed, the file name changes from /test/test.png to oss//test/test.png.

Step 3: Create a migration job

  1. Choose Data Online Migration > Migration Jobs and click Create Job.
  2. In the Create Job panel, read the terms of the migration service and select I understand the above terms and conditions, and apply for opening data migration service. Then, click Next.
    In the Fee Reminder dialog box, click Yes, Go Ahead. OSS request fee
  3. In the Job Config step, configure the following parameters and click Next.
    Parameter Required Description
    Job Name Yes Enter a task name. The name must be 3 to 63 characters in length and can contain only lowercase letters, digits, and hyphens (-). It cannot start or end with a hyphen (-).
    Source Data Address Yes Select the source data address that you created.
    Destination Data Address Yes Select the destination data address that you created.
    Notice If the source data address and destination data address are located in different countries, make sure that you have the permissions to create cross-country migration tasks. To request the permissions, submit a ticket. You must commit that your business is legitimate, the data transmission process conforms to local rules and regulations, and your data does not contain illegal information.
    Specified Directory No Specify directories in which the files and subdirectories are migrated or not migrated.
    • Do not filter: All data from the source data address is migrated.
    • Exclude: The files and subdirectories in the specified directories are not migrated.
    • Contain: Only the files and subdirectories in the specified directories are migrated.
    Note
    • You must configure a whitelist before you set the Specified Directory parameter. For more information, see Advanced features.
    • A directory name cannot start with a forward slash (/) or a backslash (\), and cannot contain double slashes (//), double periods (..), or double quotation marks ("). The character string that consists of all the specified directory names cannot exceed 10 KB in length.
    • A directory name must end with a forward slash (/). For example, you can specify docs/ as the directory name.
    • You can specify a maximum of 20 directories of the Exclude or Contain type.
    Migration Type Yes Select the data migration mode.
    • Full: The system migrates all data from the source data address to the destination data address. You must specify the Start Time Point of File parameter. The system migrates all data whose last modification time is later than the specified time. After all data is migrated, the migration task ends.

      If the data at the source data address changes after the migration is complete, you can submit another task of migrating all data. In this case, the system migrates only the data that changes.

    • Incremental: The system runs a migration task based on the specified Migration Interval and Migration Times parameters.
      • You must specify the Start Time Point of File parameter. During the first migration, the system migrates all data whose last modification time is later than the specified time. After the first migration is complete, incremental migrations are performed at an interval specified by the Migration Interval parameter. For each incremental migration, the system migrates only the data that is created or modified after the previous migration starts and before the current migration starts.
      • If you set Migration Times to N, the full migration is performed once and then the incremental migration is performed for (N - 1) times.

        For example, assume that you set Migration Interval to 1 hour, Migration Times to 5, and Start Time Point of File to 08:00, March 5, 2019, and the current time is 08:00, March 10, 2019. When the first migration starts, the system migrates all the files whose last modification time is between 08:00, March 5, 2019 and 08:00, March 10, 2019. In this example, the first migration requires one hour to complete and the second migration starts at 10:00, March 10, 2019. The duration from 08:00 to 10:00 consists of the hour for the first migration process and the migration interval of one hour. During the second migration, the system migrates the files whose last modification time is between 08:00, March 10, 2019 and 10:00, March 10, 2019. The migration task consists of one full migration and four incremental migrations.

    Notice Before you start a migration task of the Full or Incremental type, the system compares files at the source data address with those at the destination data address. If a source file has the same name as a destination file, the destination file is overwritten when one of the following conditions is met:
    • The Content-Type values of the source file and the destination file are different.
    • The last modification time of the source file is later than that of the destination file.
    • The size of the source file is different from that of the destination file.
    Start Time Point of File Yes Specify a time to filter data to be migrated. Data will be migrated if it is created or modified after the specified time.
    • All: All files are migrated.
    • Assign: Only the files that are created or modified after the specified time are migrated.

      For example, if you set the time to 08:00:00, November 1, 2018, only the files that are created or modified after 08:00:00, November 1, 2018 are migrated.

    Migration Interval This parameter is required when you set Migration Type to Incremental. The default value is one hour and the maximum value is 24 hours.
    Migration Times This parameter is required when you set Migration Type to Incremental. The default value is 1 and the maximum value is 30.
    File Overwrite Method Yes The method used to process the source file whose name is the same as that of a destination file. Valid values:
    • LastModified: If a source file has the same name as a destination file, the system compares the last modification time indicated by the LastModified property of the files.
      • If the last modification time of the source file is later than that of the destination file, the source file is migrated and the destination file is overwritten.
      • If the last modification time of the source file is earlier than that of the destination file, the source file is not migrated and the destination file is retained.
      • If the two files have the same last modification time, the system checks the values of the Size and Content-Type properties of the files.

        If the files have the same Size and Content-Type values, the source file is not migrated. If the two files have different values of at least one property, the source file is migrated and the destination file is overwritten.

    • Condition: If a source file has the same name as a destination file, the system compares the values of the LastModified, Size, and Content-Type properties of the two files.
      • If all property values of the two files are the same, the source file is not migrated.
      • If the two files have different values of at least one property, the source file is migrated and the destination file is overwritten.
    • All: If a source file has the same name as a destination file, the system performs no comparison and directly overwrites the destination file with the source file.
    • No: If a source file has the same name as a destination file, the system performs no comparison and directly skips the source file in the migration.
  4. In the Performance step, navigate to the Data Prediction section and configure the Data Size and File Count parameters.
    Note To ensure the success of migration jobs, we recommend that you estimate the amount of data to be migrated as accurately as possible. For more information, see Estimate the amount of data that you want to migrate.
  5. Optional:In the Performance step, navigate to the Flow Control section, specify the Time Range and Max Flow(MB/s) parameters, and then click Add.
    Note To ensure business continuity, we recommend that you configure the Time Range and Max Flow(MB/s) parameters based on the workloads of peak hours and off-peak hours.
  6. Click Create and wait until the migration job is complete.

Success Stories

For examples of migrating data from a BOS bucket to an Alibaba Cloud OSS bucket, see Migrate data of an Internet-based application to OSS.