SG0-001 · Question #541
Which of the following RAID levels can be implemented with three hard drives but has the HIGHEST latency? (Select TWO).
The correct answer is C. RAID 3 D. RAID 4. RAID levels 3 and 4 can be implemented with a minimum of three drives and often exhibit higher latency due to their dedicated parity drive design, which can become a bottleneck for write operations.
Question
Which of the following RAID levels can be implemented with three hard drives but has the HIGHEST latency? (Select TWO).
Options
- ARAID 0
- BRAID 1
- CRAID 3
- DRAID 4
- ERAID 5
How the community answered
(39 responses)- A3% (1)
- C95% (37)
- E3% (1)
Why each option
RAID levels 3 and 4 can be implemented with a minimum of three drives and often exhibit higher latency due to their dedicated parity drive design, which can become a bottleneck for write operations.
RAID 0 uses striping without parity and requires a minimum of two disks, offering high performance and low latency, but no fault tolerance.
RAID 1 uses mirroring and requires exactly two disks, providing fault tolerance but not being implementable with three drives in a single RAID 1 set.
RAID 3 uses byte-level striping with a dedicated parity drive, requiring at least three disks and suffering from high latency on write operations as all writes must update the single parity disk.
RAID 4 uses block-level striping with a dedicated parity drive, also requiring at least three disks and exhibiting high latency for small random writes because the dedicated parity drive becomes a bottleneck for every write operation.
RAID 5 uses block-level striping with distributed parity, requiring a minimum of three disks, but it generally offers better write performance and lower latency than RAID 3 or 4 because parity is distributed across all drives, avoiding a single parity drive bottleneck.
Concept tested: RAID levels characteristics and performance
Source: https://learn.microsoft.com/en-us/windows/win32/fileio/raid-levels
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