Redundancy vs Fault Tolerance

Redundancy vs Fault Tolerance

Web servers are used for serving websites so your website becomes able to go online worldwide. Web servers are incredibly reliable however it is best practice to prepare for when the server fails (just in case).

Different web server providers use different techniques for making things reliable and safe if a failure occurs. Redundancy and fault tolerance are two of them, and here we will be elaborating on these.

What is redundancy in the context of web servers?

Although redundancy means to be re-occurring, when we talk about the context of web server hosting, a redundant server is the one that is kept offline. The server is kept connected to the internet, but it is separate from the live server, so it is also kept separate.

This redundant server is only used when the traffic becomes unbearable for the live server or some downtime or failure at the live server.

What is fault tolerance in the context of web servers?

When web servers are hosting, there could be bugs or failures. In this case, some systems fail even because of a minor bug. On the other hand, some servers have a feature known as fault tolerance. It is the ability that makes the system able to operate even when one or more of the components faults.

  • These systems work by providing the backup components to the live servers.
  • Whenever a failure happens, the failure tolerance system replaces the failed component automatically.
  • It makes sure that there is no loss of services or reliability in this case.
If you fail to plan, you are planning to fail!

The major differences between redundancy and fault tolerance

Although both the redundancy and fault tolerance in web servers are there to ensure that the server has no failure. There are some major differences in both these terminologies. Some of these differences are:

  1. The difference in hardware utilization.
    Although the main goal is the same on the software level, when it comes to hardware, redundancy means that the whole equipment is duplicated, and it is replaced when some failure occurs. On the other hand, when some failure occurs in the fault tolerance system, only the faulted hardware is replaced with primary hardware staying the same. In this way, the quality of services increases.

  2. The difference in cost.
    When you get redundancy and fault tolerance in the web server hosting services, redundancy often costs low, so it is used more often. On the other hand, fault tolerance is used less, and only those clients go for these services which cannot bear failure at all.

Final Remarks:

Having a website is not the only important thing but making it perform well is what matters the most. In this case, hosting & speed has a great role in making your website successful. Here we were discussing its importance and how it works.

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