PAS-C01 Operations and Maintenance Practice Question
A company is running SAP HANA on a memory-optimized EC2 instance with an EBS volume for /hana/data and /hana/log. The database administrator notices that the /hana/log volume is experiencing high write latency. The current volume is a gp2 volume with 1000 GB size. Which change would most effectively reduce write latency?
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
✓
Ensure the EC2 instance is EBS-optimized and use a higher instance type with dedicated EBS bandwidth.
Using EBS-optimized instances with dedicated EBS bandwidth reduces contention and latency, improving write performance for SAP HANA log. Option A is wrong because changing to st1 is not ideal for log writes; st1 is optimized for throughput, not low latency, and has variable performance. Option B is wrong because increasing volume size increases baseline IOPS for gp2 but does not directly address write latency; latency is influenced more by burst credits and instance EBS bandwidth. Option C is wrong because enabling Multi-Attach does not reduce latency; it allows multiple instances to attach the same volume but can introduce contention.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Change the volume type to st1 (throughput optimized) for better write throughput.
Why it's wrong here
st1 is not designed for low-latency writes typical of database logs.
- ✗
Increase the volume size to 2000 GB to get more IOPS.
Why it's wrong here
More IOPS may not directly reduce latency; latency is also affected by network and instance performance.
- ✗
Enable Multi-Attach on the volume to distribute writes.
Why it's wrong here
Multi-Attach does not reduce latency; it allows multiple instances to attach.
- ✓
Ensure the EC2 instance is EBS-optimized and use a higher instance type with dedicated EBS bandwidth.
Why this is correct
EBS-optimized instances provide dedicated throughput to EBS, reducing latency.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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