NS0-158 · Question #18
Click the Exhibit button. The size of the aggr1 RAID group shown in the exhibit is 8. What is the RAID type?
The correct answer is C. RAID4. The question refers to a NetApp ONTAP aggregate RAID group with a size of 8. RAID4 is a single-parity RAID type that was historically used for aggregates in NetApp systems, consistent with a group of 8 disks where one is for parity.
Question
Click the Exhibit button. The size of the aggr1 RAID group shown in the exhibit is 8. What is the RAID type?
Options
- ARAID-TEC
- BRAID-DP
- CRAID4
- DRAID0
How the community answered
(30 responses)- A3% (1)
- B3% (1)
- C93% (28)
Why each option
The question refers to a NetApp ONTAP aggregate RAID group with a size of 8. RAID4 is a single-parity RAID type that was historically used for aggregates in NetApp systems, consistent with a group of 8 disks where one is for parity.
RAID-TEC (Triple Erasure Coding) uses three parity disks per RAID group, which would not align with a 'RAID group size of 8' implying a single parity disk.
RAID-DP (RAID Double Parity) uses two parity disks per RAID group, providing better data protection than RAID4 but not matching a single-parity assumption if that's what 'RAID group size 8' implies.
RAID4, or Striped Array with Dedicated Parity, is a NetApp-specific RAID type that uses a single dedicated parity disk for fault tolerance within a RAID group. Although newer ONTAP versions default to RAID-DP, RAID4 was commonly used, and a RAID group size of 8 typically represents 7 data disks plus 1 parity disk in a RAID4 configuration.
RAID0 (Striping) offers no data redundancy, making it an unsuitable choice for aggregates that require fault tolerance, and it does not fit the context of a 'RAID group' implying protection.
Concept tested: NetApp ONTAP RAID types and configurations
Source: https://docs.netapp.com/us-en/ontap/raid-dp/index.html
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