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SG0-001 · Question #235

Servers, storage, and switches in a SAN all have multiple power supplies in N+1 configuration. Each server and storage system has dual connections to the fabric. Which of the following BEST describes

The correct answer is D. High availability components. The described configuration of multiple power supplies (N+1) and dual connections for individual servers, storage systems, and switches characterizes high availability at the component level. This design mitigates single points of failure for individual devices.

Storage Implementation

Question

Servers, storage, and switches in a SAN all have multiple power supplies in N+1 configuration. Each server and storage system has dual connections to the fabric. Which of the following BEST describes this configuration?

Options

  • AHigh availability, fully redundant SAN
  • BFully resilient SAN
  • CFully redundant SAN
  • DHigh availability components

How the community answered

(33 responses)
  • A
    9% (3)
  • B
    3% (1)
  • C
    15% (5)
  • D
    73% (24)

Why each option

The described configuration of multiple power supplies (N+1) and dual connections for individual servers, storage systems, and switches characterizes high availability at the component level. This design mitigates single points of failure for individual devices.

AHigh availability, fully redundant SAN

"High availability, fully redundant SAN" is too strong a claim as the description focuses on component-level redundancy and dual connections, not explicitly stating a fully redundant SAN fabric or comprehensive path redundancy.

BFully resilient SAN

"Fully resilient SAN" implies a comprehensive design against all failure types and single points of failure across the entire SAN, which is not fully supported by the component-level redundancy described.

CFully redundant SAN

"Fully redundant SAN" implies redundancy for all critical paths and components throughout the entire SAN architecture, which is not explicitly stated beyond individual component power and dual connections.

DHigh availability componentsCorrect

High availability components accurately describes the scenario where individual parts like servers, storage arrays, and SAN switches are equipped with redundant power supplies (N+1) and dual connections to the fabric. These features make each component more fault-tolerant and less prone to single points of failure, thereby contributing to the overall system's high availability without necessarily implying a fully redundant or resilient end-to-end SAN fabric.

Concept tested: Component-level redundancy in SAN

Source: https://www.ibm.com/docs/en/ztpf/2019?topic=storage-designing-redundant-san

Topics

#high availability#redundancy#SAN architecture#N+1

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