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.
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)- A9% (3)
- B3% (1)
- C15% (5)
- D73% (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.
"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.
"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.
"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.
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
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