An enterprise plans to purchase a set of storage devices. The enterprise business has different requirements for storage performance. When planning and designing hard disk selection, which of the…

Question

Options

• AThe performance layer uses SAS hard disk
• BSSD hard disk is recommended for high performance layer
• CEnterprises have different requirements for storage performance. Considering the cost issue, it is
• DThe capacity layer uses SATA HDD hard disk

• A
  9% (5)
• B
  6% (3)
• C
  2% (1)
• D
  83% (45)

Explanation

Option D is incorrect because enterprise-grade capacity (cold data) tiers use NL-SAS (Near-Line SAS) hard disks, not standard SATA HDDs. NL-SAS drives use SATA platters for density and cost efficiency, but with a SAS interface that provides dual-port connectivity, higher reliability, and enterprise-grade error recovery - features that pure SATA HDDs lack in a shared storage environment.

Why the distractors are correct (not wrong):

• A is accurate: SAS HDDs (10K–15K RPM) are the standard choice for the performance tier, offering high IOPS and throughput at a lower cost than SSDs.
• B is accurate: SSDs deliver the lowest latency and highest IOPS, making them the right fit for the high-performance (hot data) tier.
• C is accurate (though truncated): tiered storage - using different drive types per workload - is precisely the cost-conscious strategy enterprises adopt to balance performance and budget.

Memory tip: Think of the three-tier stack as "SSD → SAS → NL-SAS" (fastest/costliest to slowest/cheapest). The trap in option D is confusing NL-SAS with SATA - remember that enterprise storage avoids raw SATA because it's a consumer interface; even the "cheap" capacity tier needs the SAS interface for reliability.

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