1Z0-1123-25 Question 33
Single answerYour organization is planning a wave-based migration of several on-premises Windows and Linux VMs to Oracle Cloud Infrastructure (OCI) using Oracle Cloud Migrations Service. The goal is to minimize downtime and ensure that each wave of applications can be validated in OCI before a final cutover. Which design approach best meets these requirements while maintaining data consistency?
- A
Perform an offline migration for each wave by shutting down the on-premises systems, exporting VM images manually, and then importing them into OCI.
- B
Configure continuous block-level replication using Oracle Cloud Migrations Service, validate workloads in a test environment, and then perform an incremental cutover for each wave.
- C
Migrate all workloads simultaneously using the Oracle Cloud Migrations Service, then switch DNS settings to OCI immediately after all workloads are imported.
- D
Use a custom script to copy VMDK files to OCI Object Storage and manually rediscover them under Oracle Cloud Migrations Service for each wave.
Show answer and explanation
Correct answer: B
Explanation
Using Oracle Cloud Migrations Service with a continuous or incremental replication method enables you to synchronize data between on-premises environments and OCI for each wave. This strategy ensures that each wave of workloads can be tested and validated in OCI before final cutover, thereby minimizing downtime for production systems. For additional details, refer to the Oracle Cloud Migrations Service documentation on planning wave-based migrations and incremental replication.
- A. Incorrect.
Option 1: This approach involves an offline migration, which can be simpler but does not address the requirement to minimize downtime. Shutting down on-premises systems to export VM images introduces significant downtime and does not allow real-time or near real-time validation before cutover.
- B. Correct.
Option 2: Correct. Configuring continuous (or incremental) replication in Oracle Cloud Migrations Service helps keep on-premises and OCI environments in sync. By testing each wave in a controlled target environment before cutover, you can ensure minimal downtime. Once testing is complete, a final incremental update is performed, and you can confidently cut over each wave with minimal risk.
- C. Incorrect.
Option 3: Migrating all workloads in one large batch does not allow for wave-based validation. This can increase downtime and risk because issues found after the migration might affect all workloads, contradicting the requirement to validate in smaller waves.
- D. Incorrect.
Option 4: Although manually uploading VMDK files to Object Storage can transfer virtual disk data, it is not an automated, incremental replication method. Manual rediscovery also complicates the validation and cutover process, making it prone to errors and extended downtime.