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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.

Storage Functionality

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)
  • A
    3% (1)
  • C
    95% (37)
  • E
    3% (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.

ARAID 0

RAID 0 uses striping without parity and requires a minimum of two disks, offering high performance and low latency, but no fault tolerance.

BRAID 1

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.

CRAID 3Correct

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.

DRAID 4Correct

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.

ERAID 5

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

Topics

#RAID levels#RAID latency#RAID 3#RAID 4

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