Azure Tutorials Series - Service Level Agreements(SLA)

-
We have gone through how to interact with Azure using different means, such as GUI, CLI,  powershell, bash and other features. In this article we will learn about Service Level Agreements provided by Azure to its customers, that mostly is the commitment from Microsoft of uptime and availability, any commitment which falls short of its SLA, customer is rewarded by Microsoft. Let's learn more about Azure SLAs.

Azure Service Level Agreements(SLAs)

  • With the service, there are SLAs associated with it.
  • SLAs are performance standards defined by Microsoft.
  • There are SLAs for individual products and services offered by Microsoft
  • It is not imperative each and every service has SLAs attached to it, for example, free or Shared tiers doesn't have any SLAs or Azure advisor.
  • Most prominent feature of SLA of Microsoft is uptime guarantee and believe me, it ranges from 99.9 to 99.999
  • For Azure cosmos DB, we have SLA of 99.999%, that is 5 minutes of downtime in an year.
  • Monthly uptime is calculated by (Maximum Available Minutes-Downtime) / Maximum Available Minutes X 100
  • In case, if SLAs are not met, customer gets compensation in the next monthly bill for the downtime.

Composite SLA

  • Different products and Services have different SLAs
  • If more than one service goes down, SLAs are calculated using a formula.
  • For an example, any web app has SLA of 99.95% and SQL database backend has 99.99%
  • if one goes down other service will be impacted
  • to calculate SLA, 99.95 * 99.99 = 0.994
  • The composite SLA could be more than individual SLAs.

Some points to remember-

  • SLA for 2 or more virtual machines in an availability set is 99.95%
  • While SLA for 2 or more Azure Virtual Machines that have been manually placed into different availability zones in a same region is 99.99%
  • SLA for 2 or more virtual machines placed in a same availability set in the same region is 99.95%
  • Availability Zones offers 99.99% availability when configured correctly.
All the SLAs helps to improve availability, resiliency and disaster recovery. Happy Learning!

Comments

Post a Comment

Popular posts from this blog

Azure Tutorials Series - Azure Networking

-
Image
In this article, we will learn about Azure networking concepts such as architecture, microservices, virtual networks, VPNs, subnet, VPN gateways and most importantly Network Security Group(NSG). All these terms are to be understood if you appearing for AZ900 Microsoft Azure Fundamentals exam. Azure Networking In previous articles we have learnt about Micro- services and how they work, these are alos loosely coupled architecture. Some of the features includes Independent components interact with each other with the help of queues Can be updated and deployed independently Highly scalable Supports Asynchronous messaging N-tier Architecture Supports loosely coupled architecture Application divided into multiple tiers such that higher tier can access lower tier but not vice versa Tiers are re-usable and can be updated or replaced easily without any hassle. Three-tier in general Web Tier(front end) Application tier(back end) Data tier(Storage) Virtual Network Isolated network shared by few g
Read more

Coforge Interview Questions | Automation Testing profile

-
Image
In this article we will cover recent Coforge Interview questions asked for testing profile.  Date of Interview - 19th December 2020 Mode of Interview - Web conference through TEAMS Interviewer - Rahul Sharma Round - L1 Coforge Interview Questions | Automation testing profile Round L1 Tell me about your project I have been working as a QA for XYZ company from 5.4 years, during this tenure,  I have learnt about Manual testing, Selenium, Database testing, TestNg, framework designing and API testing. What is a webdriver? A webdriver is a an automation framework that allows executing our tests in different browsers. It also supports headless execution using HtmlUnit driver. What are hooks? @Before and @After are called Hooks, they are used before and after any test scenario. How would you like your automation framework to be designed? How can you use data properties in Test NG framework? Explain Access specifiers? Access modifiers define the visibility of the class. There are four different
Read more

Testing in CI/CD

-
If you are part of testing fraternity you would have heard CI/CD numerous times by now. It's the talk of the software testing town. In this article, we will cover the basics of CI/CD, what actually it is and how it is implemented in software testing. What is continuous integration? In simple terms, development teams can integrate their code into a shared repository. This helps in maintaining code quality and identifying potential issues with the local version of the code at an early stage. What is continuous delivery? Everything that is being continuously merged by the development team, is continuously deployed to the live environment. Continuous delivery is often coined as ‘Continuous Deployment’ as well. Since most developers work in parallel, continuously integrating their code into one repository would mean that the master branch is continuously updated with new features. In order to ensure that there is no compromise in the code quality with so many changes
Read more