PAS-C01 Technology Practice Question
An SAP system administrator is configuring an SAP HANA database on an EC2 instance with multiple EBS volumes. The administrator wants to ensure that the data volumes are mirrored to protect against volume failure. Which RAID configuration should the administrator use for the HANA data volumes?
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
✓
RAID 10
RAID 10 (striping + mirroring) is recommended for SAP HANA data volumes on AWS because it provides both high performance through striping and redundancy through mirroring, protecting against EBS volume failure. RAID 0 offers no fault tolerance. RAID 5 and RAID 6 introduce significant write penalties due to parity calculations, which can degrade HANA performance.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RAID 5
Why it's wrong here
RAID 5 has parity write penalty and is not recommended for HANA.
- ✗
RAID 0
Why it's wrong here
RAID 0 has no redundancy; failure of one volume causes data loss.
- ✓
RAID 10
Why this is correct
RAID 10 combines mirroring and striping for performance and redundancy.
- ✗
RAID 6
Why it's wrong here
RAID 6 has double parity write penalty, not optimal.
Quick reference
RAID Level Comparison
| RAID Level | Min Disks | Fault Tolerance | Read | Write | Usable Capacity |
|---|---|---|---|---|---|
| RAID 0 | 2 | None | Excellent | Excellent | 100% |
| RAID 1 | 2 | 1 disk | Good | Moderate | 50% |
| RAID 5 | 3 | 1 disk | Good | Moderate | 67–94% |
| RAID 6 | 4 | 2 disks | Good | Lower | 50–88% |
| RAID 10 | 4 | 1 disk per mirror | Excellent | Good | 50% |
RAID is not a backup strategy — it protects against disk failure but not against accidental deletion, ransomware, or site-level events.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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