The requirement to ensure all management components are redundant at the component level is a core strategy for achieving high availability. Availability, as a design quality, measures a system's uptime and its ability to remain operational despite component failures. By implementing redundancy, you eliminate single points of failure (SPOFs), ensuring that the failure of one component does not cause a service outage because a redundant component can take over. This directly addresses the goal of keeping the management plane continuously accessible and functional.

A. Performance: This quality relates to system speed, latency, and throughput. Redundancy is primarily for fault tolerance, not for enhancing operational speed.

B. Manageability: This quality concerns the ease of operating, monitoring, and maintaining the system. Adding redundancy can sometimes increase, not decrease, management complexity.

D. Recoverability: This quality focuses on restoring a service after a catastrophic failure (e.g., restoring from backups). Availability aims to prevent downtime in the first place through redundancy.

1. VMware vCloud Architecture Toolkit (vCAT) 3.0

Page 100

Section "Availability Design".

The document states

"Availability is the measure of a system’s uptime... Key design decisions that affect availability include... component redundancy

component health monitoring

and failover." This directly links component redundancy to the design quality of Availability.

2. VMware vSphere 6.7 Availability Guide

PDF

Page 8

Chapter 1 "Introduction to vSphere Availability".

This guide explains that features like vSphere High Availability (HA) leverage a redundant pool of resources (multiple ESXi hosts) to ensure that virtual machines remain available even if a physical server fails. This illustrates the principle of using redundancy to achieve availability.

3. VMware Press

"VCDX Boot Camp: Preparing for the VCDX Defense" by John Arrasjid

Ben Lin

and Mostafa Khalil

ISBN: 978-0321912296

Chapter 3

"The Design Qualities".

This official VMware Press book

aimed at architects

defines availability as the ability of a system to be accessible and operational. It explicitly lists redundancy as a primary mechanism for achieving this quality.