Monday, 04 October 2021 14:45

7 Best Practices for Creating a High Availability Infrastructure

Written by Savan Kharod
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Source https://blogs.sap.com/2021/10/05/7-best-practices-for-creating-a-high-availability-infrastructure/
“© 2020. SAP SE or an SAP affiliate company. All rights reserved.” “Used with permission of SAP SE”

Cloud computing has revolutionized the way an IT company works in the present age. Without cloud power, many small and large organizations would have massive trouble conducting their functions and serving customers.

The cloud makes all hardware and software resources flexible, accessible, and efficient through its interface and features. But to avail this service productively, it needs to be working at all times.
With increasing demands for cloud computing services, companies rely on them fully to be stable whenever they are needed. Thus, any downtime for applications or services creates issues for the business and its customers. This is where high availability infrastructure comes in.

What Is High Availability?

High availability is a system or component that remains operational for long periods of time without any interruption. It is generally measured as a percentage, with a 100% system meaning that the service has experienced zero downtime.

However, it is difficult to maintain a complex system that never fails. A 99% and above the rate of uptime is considered excellent performance. Companies like Google, Amazon, and Microsoft keep their service availability at 99.9%.

Cloud computing available is measured in several factors, such as recovery time, unanticipated loads, increased usage, scheduled maintenance, and unscheduled maintenance periods. Hence, it is a percentage defined by service level agreements (SLAs).

High availability and uptime, though they sound similar, are not the same concepts. Availability denotes how accessible the server is or the number of connections it allows, whereas uptime refers to whether the server is reachable by even one service. Hence, uptime is an infrastructure level capacity, and HA is application level.

How to Achieve High Availability

There are various steps you can take to achieve high availability in your system, like having more components for a safety buffer, performing regular checks, and replacing failed servers. Here are seven practices that can help you create a high availability infrastructure.

1. Use Autoscaling

Autoscaling is the automatic adjustment of cloud computing services, in which the cloud computing dynamically adjusts the number of computing resources in a server, depending on the load and active servers. SAP’s Application Autoscaler lets you do this by automatically increasing or decreasing the number of application instances based on the policies defined.

Through autoscaling, you can ensure that no additional resources are utilized when not in need and also that there is no dearth of active instances when load increases. You can scale up or out, which is either increasing the size of the machine to increase RAM for processing or combining multiple independent computers into a system.

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