Book Image

Implementing Azure Cloud Design Patterns

By : Oliver Michalski, Stefano Demiliani
Book Image

Implementing Azure Cloud Design Patterns

By: Oliver Michalski, Stefano Demiliani

Overview of this book

A well designed cloud infrastructure covers factors such as consistency, maintenance, simplified administration and development, and reusability. Hence it is important to choose the right architectural pattern as it has a huge impact on the quality of cloud-hosted services. This book covers all Azure design patterns and functionalities to help you build your cloud infrastructure so it fits your system requirements. This book initially covers design patterns that are focused on factors such as availability and data management/monitoring. Then the focus shifts to complex design patterns such as multitasking, improving scalability, valet keys, and so on, with practical use cases. The book also supplies best practices to improve the security and performance of your cloud. By the end of this book, you will thoroughly be familiar with the different design and architectural patterns available with Windows Azure and capable of choosing the best pattern for your system.
Table of Contents (16 chapters)
Title Page
Packt Upsell

What is availability?

Actually, a simple question but the answer is very complex. So, in turn, look into the following approaches.

First approach

Availability is the ratio of time within an agreed period in which the system is operational for its actual purpose (operation time) at the agreed time.

The operating time may be limited by:

  • Planned maintenance
  • Unplanned maintenance
  • Error
  • Damage
  • Repair time to eliminate errors and damage

The measure of availability is usually given as a percentage.

Second approach

Alternatively, availability is also defined as the proportion of available objects (services) in the total number of objects (services). In summary, availability is thus a quality criterion and a measure for a system, subsystem, service, and so on. So, now you know what availability means. In the following sections, we will concentrate on the first approach presented.