What is Fault Tolerance?

Fault tolerance refers to the system’s ability to tolerate faults and handle errors without data loss. In other words, fault tolerance is the backbone of an operating system, making sure there is an uninterrupted operation despite failures or malfunctions in the computer system. Creating a fault-tolerant system aims to prevent disruptions arising from a single point of failure, ensuring the business continuity and high availability of mission-critical applications or systems.

Read more on what is business continuity management?

Understanding Faults and Failures

At this point, you are wondering the difference between faults and failures. Yes, the difference is insignificant, but faults that are what result in the tolerance built into a system’s infrastructure. Faults are abnormal disruption that occurs in a system’s component or infrastructure. These can include communication errors, bugs, hardware malfunctions, or issues with the power supply. 

On the other hand, failures spring up from the consequences of faults. When faults are not properly handled or resolved in a system’s infrastructure they lead to system failures, performance issues, partial network failures, and low availability. Failed components become something that could take a lot of time to fix.

Element of Fault Tolerant Systems

  1. Software: Software faults occur when there are bugs, coding errors, or vulnerabilities in the system’s software components. These faults can cause application crashes, incorrect output, or security vulnerabilities.
  2. Network: One of the major reasons for a failed system is network faults. It could involve failures in creating proper communication with channels, routers faults, switches, or network protocols. These faults can result in packet loss, latency, or network unavailability.
  3. Hardware: Most times, hardware components can experience failures due to aging, overheating, electrical issues, or manufacturing defects that could lead to a disconnect from the firewall or cloud servers. It could lead to system crashes, data corruption, or hardware malfunctions.
  4. Power Sources: Power outages due to the delayed response of backup generators could create faults.  Power faults like electricity surges or fluctuations can disrupt the system’s functioning and lead to possible shutdowns, data loss, or hardware damage.
  5. Environmental: Environmental faults include extreme temperatures, humidity, electromagnetic interference, or natural disasters. These faults can impact the physical infrastructure of the system and cause failures.

 Fault Tolerance vs. High Availability Systems

Top software engineers and even rookies in the industry get asked this question a lot. Either way, there is a lot of confusion between the two, which is understandable. Well, they both have the same goal: to keep your systems up and running in case something goes wrong within your system’s architecture. However, there is a difference between these two tech terms.  

High availability can be defined by maintaining a percentage of uptime that maintains operational performance and can closely be aligned to an SLA (service level agreement). In fact, ServerMania has many SLAs where we input our level of resilience and management to maintain high availability. 

Fault Tolerance, on the other hand,  expands on High Availability to offer greater protection should components begin to fail in your infrastructure. However, there are usually additional cost implications due to the greater level of resiliency offered.  But the upside is that your uptime percentage increases and there is no service interruption should one or more components fail.  

Fault tolerance systems are intrinsically available, but a highly available solution is not completely fault tolerant. However, it depends on the user to determine the level of fault tolerance techniques you want to implement and the business impact you could have when components begin to fail. Remember, it is not if a failure occurs but when it occurs.

Fault Tolerance Goals

Building fault-tolerant systems is more complex and generally also more expensive. The system can remain at its usual functional capacity until certain measures are implemented to restore it to its usual working capacity. Assessing your application’s fault tolerance level requires building your system accordingly to help it remain fault tolerant design when needed.

Normal Functioning vs. Graceful Degradation

When creating a fault tolerant computer systems or the architecture for a fault tolerant system, the application should always remain online and fully functional. Your objective is to keep things as normal as possible – you want your application or machine to continue operating normally even if a system component fails or goes down unexpectedly.

Another approach aims for graceful degradation, where errors can impact functionality. The system maintains partial functionality to degrade in user experience and cannot function at full capacity. 

When you build an application with normal functioning in mind, it will give users a better experience. But you know what? It usually ends up attracting more cost. It all depends on how the system is being used. You must ensure it works even in bad situations if it’s a mission-critical application or system. But for less critical situations, consider degrading over time. That can make more economic sense.

Components of a Fault tolerance System

To begin with, redundancy is a significant concern in various tech infrastructures. Redundancy includes having backup solutions for important components like power supplies, network connections, and servers. As a result, if one fails, the backup system is ready to take over and keep things going smoothly. Read more on the cloud backup server.

Scalability is another key feature. A fault-tolerant data center should handle increased workloads without breaking a sweat. As a result, if there is an unexpected rise in demand, the system may adjust and distribute resources appropriately, ensuring that performance does not suffer.

Then there’s fault isolation. This implies that the overall operation should not be affected if something goes wrong in one critical data center component. The architecture should be constructed in such a way that defects are isolated and their impact is limited, allowing other sections to continue operating normally.

Management and monitoring system failure are also essential. A fault-tolerant data center requires sophisticated monitoring systems to keep an eye on the infrastructure’s health at all times. In this manner, any problems or possible failures may be identified early, allowing proactive steps to be implemented.

Finally, we have catastrophe recovery capabilities. Natural catastrophes or catastrophic failures should be recovered using sound planning and processes in a fault-tolerant data center. Backup systems, off-site data storage, other backup components, and well-defined recovery plans are used to reduce downtime and data loss.

So those are some of the key qualities of a fault-tolerant data center, all aimed at providing high availability, resilience, and the capacity to tolerate outages while maintaining operations.

What are the Characteristics of a Fault Tolerant Data Center?

A data center must not have a single point of failure to be dubbed fault tolerant systems. As a result, it should have two parallel power and cooling systems. However, it is a bit expensive, and its benefits are not worth the cost, and the infrastructure is not based mainly on the solution. Many data centers like ServerMania have already built fault tolerance into their system in anticipation of future systems failure.


It’s all about ensuring things keep running smoothly, even when something goes wrong. Understanding faults and failures is key. So, when you’re creating a fault tolerant system, you have to figure out where things could go wrong and have backup plans in place. 

ServerMania is a cloud server host that offers dedicated hosting, including hosting security with built-in hardware fault tolerance to keep your infrastructure working during failures. We provide unique servers that are well-tailored to meet your needs.

And don’t forget about detecting faults and recovering from errors. Test everything on our server to make sure it works. We have smarter fault detection, systems that can adapt on the fly, and better security.

To learn more about server cloud backup that can help store and protect your data from unauthorized administrators, contact us at ServerMania, where you get all the offers of different operating systems with fault tolerance systems that are right and the best for you. Keep fault tolerance in mind, and your systems will stay strong no matter what.