Which technology is used on the back-end of the Hitachi Unified Storage systems?

Question

Options

• A6Gbps Fibre Channel FC-AL
• B6Gbps Point-to-Point Fibre Channel
• C6Gbps switched SATA Point-to-Point
• D6Gbps switched Serial Attached SCSI

• A
  3% (1)
• C
  3% (1)
• D
  95% (37)

Explanation

Hitachi Unified Storage (HUS) systems use 6Gbps switched Serial Attached SCSI (SAS) on the back-end to connect to disk drives, making D correct. SAS supports expander technology (the "switched" aspect), enabling scalable, high-performance, fault-tolerant disk connectivity that suits enterprise storage arrays.

Why the distractors are wrong:

• A & B (Fibre Channel FC-AL / Point-to-Point FC): Fibre Channel is a front-end host connectivity protocol used to connect servers to the storage array - not the internal back-end disk interconnect.
• C (Switched SATA Point-to-Point): SATA is a lower-cost, consumer-grade protocol without native command queuing or the reliability features required for enterprise back-end use; HUS does not use switched SATA as its back-end architecture.

Memory tip: Associate HUS = "Has Underlying SAS" - SAS is the enterprise back-end workhorse because it supports expanders (switching) and dual-porting, while FC stays on the front-end facing the hosts.

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