A media company needs to migrate existing on-premises data to the IBM Cloud. The data size is around 400 TB which will be accessed by the applications. The data needs to be migrated securely and in a short period of time. How can this be achieved using IBM Cloud?

The most effective method for migrating a very large dataset, such as 400 TB, securely and in a short timeframe is to use the IBM Cloud Mass Data Migration service. This service is specifically designed for offline data transfer of terabyte- to petabyte-scale data. It involves shipping a secure, ruggedized physical storage device to the on-premises location. Data is copied locally and then the device is shipped back to an IBM Cloud data center for a high-speed upload. This process bypasses network bandwidth limitations and is typically the fastest and most reliable method for a one-time, large-scale data migration, directly addressing the core requirements of the scenario.

A. Migrating 400 TB over a VPN, even with compression, would be extremely slow over a standard internet connection, failing the "short period of time" requirement.
B. This option is even less efficient than option A, as it omits compression. The transfer time for 400 TB over a VPN would be prohibitively long.
C. While IBM Cloud Direct Link provides a high-speed, secure network connection, its provisioning can take several weeks. It is better suited for establishing a permanent hybrid connection rather than a rapid, one-time data migration.

1. IBM Cloud Documentation - About Mass Data Migration: "IBM Cloud® Mass Data Migration is a data transport solution that uses secure, ruggedized storage devices to accelerate moving terabytes to petabytes of data into the IBM Cloud. This service is ideal for you if you need to move large amounts of data to the cloud, but your network connection is too slow or unreliable to handle the load."

Source: IBM Cloud Docs, "Getting started with IBM Cloud Mass Data Migration". (https://cloud.ibm.com/docs/mass-data-migration?topic=mass-data-migration-get-started-mdm)

2. IBM Cloud Architecture Center - Data Migration Overview: In the reference architecture for data migration, for large-scale, one-time migrations, offline transfer is recommended. "For large amounts of data (hundreds of terabytes to petabytes), a network connection might be too slow, unreliable, or expensive. In this case, you can use the IBM Cloud Mass Data Migration service."

Source: IBM Cloud Architecture Center, "Data migration to IBM Cloud reference architecture". (https://www.ibm.com/cloud/architecture/architectures/data-migration-overview/reference-architecture)

3. IBM Cloud Documentation - About IBM Cloud Direct Link: The documentation describes Direct Link as a service to create private connectivity for hybrid workloads. The ordering and provisioning process involves third-party network carriers and can have significant lead times, making it less suitable for a rapid, one-off migration compared to Mass Data Migration.

Source: IBM Cloud Docs, "Getting started with IBM Cloud Direct Link". (https://cloud.ibm.com/docs/dl?topic=dl-get-started-with-ibm-cloud-dl)