Fault Tolerance

The key benefit of fault tolerance is to minimize or avoid the risk of systems becoming unavailable due to a component error. This is particularly important in critical systems that are relied on to ensure people’s safety, such as air traffic control, and systems that protect and secure critical data and high-value transactions.

What is a Fault Tolerant System?

A fault tolerant system is a system that includes two tightly coupled components that mirror each other, providing redundancy. This way, if a primary component goes down, the secondary one is always set and immediately ready to take over. In simple terms, fault tolerant computing is a form of full hardware redundancy. Two (or more) systems operate in tandem, mirroring identical applications and executing instructions in lock step with one another.

In conclusion, a data backup plan is not just a technical necessity; it is a fundamental component of a resilient business strategy that protects vital information, supports operational continuity, and fosters long-term success.

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Fault Tolerance purpose

Benefits

In simple terms, fault tolerant computing is a form of full hardware redundancy. Two (or more) systems operate in tandem, mirroring identical applications and executing instructions in lock step with one another.

In-memory application state of any program isn’t lost in the event of a failure and access to other applications and data is maintained. In more complex systems and networks, fault tolerance ensures that any system request will ultimately be executed regardless of failures, but it might sometimes take longer as the system adapts and reroutes requests through its redundancies.

how does it work

Fault tolerant computing requires specialized hardware that can immediately detect faults in components and keep the mirrored systems running in perfect tandem.
However, in the fault tolerant model, the ability of a system to deliver high performance in the event of failure is not a top priority. In contrast, it is expected that a system can maintain operational performance, but at a reduced level.
Similarly to high availability, fault tolerance also works on the principle of redundancy.
Such redundancy can be achieved through simultaneously running one application on two servers, which enables one server to be able to instantly take over another if one were to fail.

high availability

HA focuses on delivering the minimal possible downtimes, while FT goes further by delivering zero downtime.

Fault Tolerance

Fault tolerance is the property that enables a system to continue operating properly in the event of the failure of some (one or more faults within) of its components.

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