Question 642 of 1,663
DBS-C01 Deployment and Migration Practice Question
A company has a self-managed Redis cluster that needs to be migrated to Amazon ElastiCache for Redis. The cluster is 100 GB in size and has a high write throughput. The migration must have minimal downtime. Which steps should be taken?
⚠ Common exam trap
Many candidates assume AWS DMS is a universal migration tool for any data store, but it does not support Redis, making option A a tempting but incorrect choice.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set up replication from the source to ElastiCache using Redis replication
Redis replication (using the REPLICAOF or SLAVEOF command) allows you to set up the ElastiCache cluster as a read-replica of the self-managed Redis cluster, enabling continuous, asynchronous replication with minimal downtime. Once the replica is fully synchronized, you can promote it to the primary role with a brief failover, achieving a near-zero-downtime migration. This approach is ideal for a 100 GB cluster with high write throughput, as it avoids the performance impact of snapshotting or dump/restore operations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use AWS DMS to migrate the data with ongoing replication
Why it's wrong here
DMS does not support Redis as a source.
- ✗
Take a snapshot of the source and restore to ElastiCache
Why it's wrong here
Snapshot restore requires downtime and does not capture ongoing changes.
- ✗
Use the SAVE command to create a dump, upload to S3, and import to ElastiCache
Why it's wrong here
SAVE is synchronous and may cause performance issues; BGSAVE is recommended.
- ✓
Set up replication from the source to ElastiCache using Redis replication
Why this is correct
Replication allows minimal downtime by continuously syncing changes.
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Last reviewed: Jul 4, 2026
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