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HP0-J73 · Question #318

What are characteristics of SSD drive technology? (Select two.)

The correct answer is A. Any SSD will immediately lose data when power is removed. D. SSD drives provide faster write performance by eliminating the need for raid calculations. SSDs that use volatile DRAM write caches can lose buffered data on sudden power loss, and their negligible seek latency reduces the effective write-penalty cost of RAID compared to HDDs.

Storage Industry Concepts and Terminology

Question

What are characteristics of SSD drive technology? (Select two.)

Options

  • AAny SSD will immediately lose data when power is removed.
  • BSSD drives are recommended for storage array-tiring strategies
  • CSSD drives compress data natively via the drive interface with an embedded controller.
  • DSSD drives provide faster write performance by eliminating the need for raid calculations
  • ESSD drives manage wear leveling via the drive interface board and embedded controller.

How the community answered

(38 responses)
  • A
    89% (34)
  • B
    3% (1)
  • C
    5% (2)
  • E
    3% (1)

Why each option

SSDs that use volatile DRAM write caches can lose buffered data on sudden power loss, and their negligible seek latency reduces the effective write-penalty cost of RAID compared to HDDs.

AAny SSD will immediately lose data when power is removed.Correct

SSDs that use volatile DRAM for write staging will lose any data cached there if power is abruptly removed before the buffer is flushed to NAND, which is why enterprise SSDs include onboard capacitors for power loss protection as a critical design feature.

BSSD drives are recommended for storage array-tiring strategies

Using SSDs in storage tiering strategies is an accurate deployment best practice but describes a recommended use case rather than an intrinsic physical or electrical characteristic of the SSD drive technology itself.

CSSD drives compress data natively via the drive interface with an embedded controller.

Data compression is not a native function of the SSD drive interface or embedded NAND controller - it is handled by the storage array controller, host-based software, or dedicated inline compression engines.

DSSD drives provide faster write performance by eliminating the need for raid calculationsCorrect

The near-zero seek and rotational latency of SSDs eliminates the mechanical delay that makes RAID write penalties so costly on HDDs, enabling SSDs to deliver significantly faster effective write performance even when parity-based RAID calculations are required.

ESSD drives manage wear leveling via the drive interface board and embedded controller.

Wear leveling is an internal NAND management process executed entirely within the SSD firmware and is transparent to the storage array and host, making it an implementation detail rather than an observable storage characteristic.

Concept tested: SSD power loss vulnerability and RAID write performance behavior

Source: https://www.snia.org/sites/default/files/SSSI/SSSI_Tutorial_Solid_State_Storage_SSD_for_the_Enterprise.pdf

Topics

#SSD#wear leveling#flash storage#storage tiering

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