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Difficulty: MediumAssess and Select Migration Strategy (7 Rs)

An enterprise is planning to migrate a legacy document management platform to AWS. The system consists of three tiers:
1. An IIS web application tier hosting the portal on Windows Server. Due to a datacenter lease expiration, this tier must be migrated to AWS within a strict 3-month window with minimal changes and less than 2 hours of transition downtime.
2. An Oracle Database Enterprise Edition database tier containing complex PL/SQL packages. The enterprise wants to eliminate commercial database license costs, minimize long-term administrative overhead, and migrate to Amazon Aurora PostgreSQL-Compatible Edition.
3. A legacy document archival tool that requires a physical, proprietary PCIe cryptographic hardware card connected to the server chassis for decrypting historical archives. The hardware vendor does not support virtualization or cloud environments.

Which of the following migration strategies represent the correct mapping of the 7 Rs framework for these components? (Select TWO.)

  1. Rehost the IIS web application tier to Amazon EC2 using AWS Application Migration Service (MGN), and Retain the legacy document archival tool on-premises.Answer
  2. Refactor the database tier from Oracle to Amazon Aurora PostgreSQL-Compatible Edition by using the AWS Schema Conversion Tool (SCT) and AWS Database Migration Service (DMS).Answer
  3. C
    Replatform the database tier by converting the Oracle database to Amazon Aurora PostgreSQL-Compatible Edition using the AWS Schema Conversion Tool (SCT).
  4. D
    Replatform the legacy document archival tool by moving it to an Amazon EC2 Dedicated Host and utilizing AWS CloudHSM to virtualize the PCIe cryptographic hardware.
  5. E
    Refactor the IIS web application tier by rewriting the application to run on AWS Lambda to ensure maximum scalability prior to migration.

Answer

The correct strategy mappings are: (1) Rehost the IIS web application tier using AWS Application Migration Service (MGN) and Retain the legacy document archival tool on-premises, and (2) Refactor the database tier from Oracle to Amazon Aurora PostgreSQL-Compatible Edition by using the AWS Schema Conversion Tool (SCT) and AWS Database Migration Service (DMS).
The correct choices identify that migrating the web application to Amazon EC2 with minimal modifications under a tight timeline is a Rehost strategy, while keeping the legacy hardware-dependent archival tool on-premises is a Retain strategy. Additionally, converting the database from Oracle to Aurora PostgreSQL represents a Refactor strategy because changing database engines requires converting database schemas and rewriting stored procedures.

Step-by-Step Solution

1
Analyze the requirements and constraints of the web application tier.
The web application tier requires migration within a strict 3-month window with minimal modifications.
Because of the tight schedule and minimal change requirements, Rehost (using block-level migration tools like AWS MGN) is the correct strategy.
2
Analyze the requirements and constraints of the database tier.
The database needs to migrate from Oracle to Amazon Aurora PostgreSQL to optimize licensing costs.
Migrating to a completely different database engine requires schema translation and code modification, which constitutes a Refactor (Re-architect) migration path.
3
Analyze the requirements and constraints of the legacy document archival tool.
The archival tool relies on a physical PCIe cryptographic card that cannot be virtualized or operated in AWS.
Since the physical hardware dependency cannot be migrated or replicated in the cloud, this component must be Retained on-premises.

Key Concept

Selecting migration strategies under the 7 Rs framework based on application dependencies, target engine changes, and migration schedule constraints.
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Assess and Select Migration Strategy (7 Rs)

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