The answer is to increase the disk queue depth on the source server or add additional disks to improve I/O performance. This resolves the AWS MGN replication stall because Application Migration Service relies on continuous block-level replication, and a shallow disk queue depth on the source server creates a bottleneck that prevents the agent from reading and transmitting data fast enough, causing the progress to freeze. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding that MGN replication stalls during SAP migration are rarely due to network bandwidth—1 Gbps Direct Connect is sufficient for a 500 GB disk—but instead stem from source-side I/O constraints, a common trap where candidates blame the network or staging area. Remember the memory tip: “Queue depth, not bandwidth, is the hand that stalls the MGN stand.”
PAS-C01 Migration Practice Question
This PAS-C01 practice question tests your understanding of migration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A retail company is migrating its SAP ERP system from on-premises to AWS. The system includes an SAP HANA database (2 TB) and an SAP NetWeaver application server. The migration strategy is to use SAP HANA System Replication (HSR) to replicate the database to an EC2 instance running SAP HANA, then perform a takeover. The application server will be migrated using AWS Application Migration Service (MGN). The network connection is AWS Direct Connect with 1 Gbps bandwidth. During a test migration, the HSR replication is working, but the application server replication through MGN is taking much longer than expected. The MGN console shows that the data replication progress is stuck at 45% for several hours. The source server is a physical server with a 500 GB disk, 75% utilized. Which action is most likely to resolve the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the disk queue depth on the source server or add additional disks to improve I/O performance.
MGN replication stalls often due to disk queue depth issues on the source. Option A is correct because increasing disk throughput can help. Option B is wrong because MGN uses block-level replication, not file-based. Option C is wrong because the network bandwidth is 1 Gbps, which is adequate. Option D is wrong because MGN does not have a staging area that can be increased; the staging area is on the source.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Increase the disk queue depth on the source server or add additional disks to improve I/O performance.
Why this is correct
MGN replication can be throttled by disk I/O.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Convert the source disks to dynamic disks to improve replication speed.
Why it's wrong here
Disk type conversion does not improve MGN speed.
✗
Increase the staging area size in the MGN replication settings.
Why it's wrong here
MGN does not have a configurable staging area size.
✗
Increase the Direct Connect bandwidth to 10 Gbps.
Why it's wrong here
Bandwidth is not the bottleneck at 45% replication.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related PAS-C01 OSPF questions on adjacency and route selection.
Migration — This question tests Migration — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Increase the disk queue depth on the source server or add additional disks to improve I/O performance. — MGN replication stalls often due to disk queue depth issues on the source. Option A is correct because increasing disk throughput can help. Option B is wrong because MGN uses block-level replication, not file-based. Option C is wrong because the network bandwidth is 1 Gbps, which is adequate. Option D is wrong because MGN does not have a staging area that can be increased; the staging area is on the source.
What should I do if I get this PAS-C01 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related PAS-C01 OSPF questions on adjacency and route selection.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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