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Difficulty: Very hardAssess and Select Migration Strategy (7 Rs)

An enterprise is planning to migrate its legacy portfolio management suite to AWS. The suite contains the following workloads:

1. Web Portal: A Java 8 application running on Apache Tomcat on legacy SUSE Linux Enterprise Server 11. The operating system is unsupported, and the security team requires upgrading the OS to Amazon Linux 2023 during the migration. The application code must remain unchanged.
2. Risk Engine: A proprietary C++ binary compiled specifically for IBM AIX on IBM Power Systems. The source code is unavailable, and the vendor went out of business. The engine performs critical calculations and communicates with other components via TCP/IP.
3. Ledger Database: A self-managed 8 TB Oracle Database Enterprise Edition instance running on-premises, which relies heavily on advanced proprietary PL/SQL packages for compliance auditing. The enterprise wants to reduce operational and administrative database overhead but must maintain the existing auditing mechanisms. The maximum database cutover window is 1 hour.

Which combination of migration strategies represents the most appropriate path for these workloads according to the AWS 7 Rs framework?

  1. A
    Rehost the Web Portal on Amazon EC2 using AWS Application Migration Service (AWS MGN); Replatform the Risk Engine by packaging it into a Linux-based Docker container on Amazon ECS; Rehost the Ledger Database on Oracle Database on Amazon EC2.
  2. B
    Replatform the Web Portal to Amazon Linux 2023; Rehost the Risk Engine on Amazon EC2 Dedicated Hosts using AWS Application Migration Service (AWS MGN); Refactor the Ledger Database to Amazon Aurora PostgreSQL using the AWS Schema Conversion Tool (AWS SCT) and AWS DMS.
  3. Replatform the Web Portal to Amazon Linux 2023; Retain the Risk Engine on-premises and establish hybrid connectivity; Replatform the Ledger Database to Amazon RDS for Oracle using AWS Database Migration Service (AWS DMS).Answer
  4. D
    Replatform the Web Portal to Amazon Linux 2023; Retain the Risk Engine on-premises and establish hybrid connectivity; Refactor the Ledger Database to Amazon Aurora PostgreSQL using the AWS Schema Conversion Tool (AWS SCT) and AWS DMS.

Answer

Replatform the Web Portal to Amazon Linux 2023; Retain the Risk Engine on-premises and establish hybrid connectivity; Replatform the Ledger Database to Amazon RDS for Oracle using AWS Database Migration Service (AWS DMS).
The correct solution correctly identifies the appropriate 7 Rs strategy for each workload component based on its constraints. For the Web Portal, upgrading the underlying operating system platform during migration without modifying the application code constitutes a Replatform strategy. For the Risk Engine, since the proprietary binary is compiled for the IBM AIX operating system on IBM Power Systems architecture and the source code is unavailable, it cannot be run on standard AWS x86 or ARM instances, nor can it be migrated using AWS Application Migration Service (MGN). Thus, it must be Retained on-premises with hybrid networking. For the Ledger Database, migrating from self-managed Oracle to Amazon RDS for Oracle represents a Replatform strategy because it shifts the administrative platform to a managed service while keeping the engine identical, preserving complex PL/SQL packages. Using AWS DMS enables replication and a cutover time of less than 1 hour.

Step-by-Step Solution

1
Analyze the Web Portal migration strategy.
Identify that upgrading the operating system platform from legacy SUSE Linux 11 to Amazon Linux 2023, while keeping application code unchanged, maps to a Replatform strategy.
Upgrading platform components (OS, runtime) during migration without altering application architecture is classified as Replatforming.
2
Analyze the Risk Engine migration compatibility.
Determine that because the engine is a compiled AIX binary for IBM Power Systems (non-x86/non-ARM architecture) and source code is unavailable, it cannot be run on AWS compute resources. It must be Retained on-premises.
AWS Application Migration Service (MGN) and EC2 do not support IBM AIX on Power Systems. Since recompilation is impossible, the workload must remain on-premises (Retain) with hybrid connectivity.
3
Analyze the Ledger Database requirements and select the appropriate 7 Rs strategy.
Determine that migrating the self-managed database to Amazon RDS for Oracle is a Replatform strategy that fulfills the managed service requirement. It retains Oracle features (PL/SQL packages) and meets the 1-hour downtime cutover window using AWS DMS.
Refactoring the database to Aurora PostgreSQL is too high-risk and time-consuming because of proprietary PL/SQL auditing requirements. Rehosting on EC2 fails to reduce administrative overhead. Replatforming to Amazon RDS for Oracle satisfies all constraints.

Key Concept

Workload assessment and strategy selection (7 Rs) based on OS/hardware architecture limits, proprietary software licensing, database engine dependencies, and operational SLA requirements.
Estimated Time:3m 0s
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Assess and Select Migration Strategy (7 Rs)

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