This topic describes how to prepare for a migration.

UCloud US3

  • Estimate the amount of data to be migrated

    Estimate the amount of data to be migrated. Log on to the UCloud console, choose All Products > US3 > Bucket, and then click the name of the bucket that stores the source data. Choose Overview > Monitoring Information, and check the size of the data that is stored in the bucket.

    Note To ensure that data can be migrated as expected, you must specify an appropriate size and number of objects when you create a migration job.
  • Restore the data in the bucket
    Data Online Migration does not restore data in archived files during migration. Before you create a migration job to migrate data of the Archive storage class, you must manually restore the data. Otherwise, the files that are not restored or are being restored cannot be migrated. For more information about how to restore data of the Archive storage class, see Solutions to migrate archived data.
    Note
    • Before you create a source data address and a migration job, make sure that data of the Archive storage class is restored.
    • The time required to restore data of the Archive storage class is based on the amount of data. Make sure that you specify an appropriate value for the restoration duration. This can prevent data from entering the archived state during migration.
    • You may be charged for the restoration operation. For information about the billing methods, contact the service provider that offers the source bucket.
  • Create a cloud API public key and private key for the migration.

    In the UCloud console, choose Resources Statistics > UFile & CDN and select a value in the Bucket column. The public key and private key management page appears. Choose Token management > Create token, and view and create public keys and private keys.

Alibaba Cloud Object Storage Service (OSS)

  • Create a destination OSS bucket.

    Create a destination bucket to store the migrated data. For more information, see Create buckets.

  • Create a RAM user and grant required permissions to the RAM user.
    1. Log on to the Resource Access Management (RAM) console.
    2. In the left-side navigation pane, choose Identities > Users.
    3. On the Users page, click Create User.
    4. On the Create User page, specify the Logon Name and Display Name parameters in the User Account Information section.
    5. In the Access Mode section, select Console Access and OpenAPI Access. Then, save the generated logon name, password, AccessKey ID, and AccessKey secret.
      1. Console Access: If you select this check box, you must configure the console password, password reset settings, and multi-factor authentication settings.
      2. OpenAPI Access: If you select this check box, an AccessKey pair is automatically created for the RAM user. The RAM user can call API operations or use other development tools to access Alibaba Cloud resources.
    6. After the RAM user is created, return to the Users page. Find the RAM user and click Add Permissions in the Actions column. In the panel that appears, select the AliyunOSSFullAccess and AliyunMGWFullAccess policies and click OK. This way, the RAM user is granted the read and write permissions on OSS buckets and the permissions to perform online data migrations.
    7. In the left-side navigation pane, click Overview.
    8. On the page that appears, navigate to the Account Management section and click the link under RAM user logon. On the page that appears, enter the logon name and password of the RAM user to log on to the Alibaba Cloud Management Console.