VMware Fault Tolerance vs. High Availability

Published On: 2nd July 2020//2.2 min read//Tags: , , //

Businesses today depend heavily on their IT systems to keep everyday operations up and running. Many organizations require minimal to zero disruption to applications and services, in order to maintain productivity and profitability. However, eliminating IT downtime entirely and achieving true high availability is often easier said than done.

What is Fault Tolerance?

Fault Tolerance is a property that enables a system to continue operating seamlessly in the event of the failure of some of its components, or one or more faults within its components.

VMware Fault Tolerance aims to eliminate downtime, by introducing an extra layer of protection. It effectively duplicates the VM in real time and makes that VM available to another host as a hot-standby. Should the same failure of one host occur, the standby is immediately brought into action and “takes-over” where the failed VM left off, with no VM/operating system restart. The time between failure and resumption of services is much smaller here enabling most workloads to survive the crossover with no loss of running data.

High Availability vs. Fault Tolerance

VMware Fault Tolerance differs from the concept of high availability due to its capability in maintaining virtually no disruption to applications in the wake of a failure. A highly available system can prevent downtime, but if a node is lost, there is a delay in restarting its applications on another node in the same cluster. Consequently, this delay causes significant problems for mission-critical applications and systems that cannot tolerate disruptions in service. Fault Tolerance takes the concept of high availability one step further. It ensures that those applications are ready to maintain operation on a remaining cluster node should one fail, without impacting on service.

Simple, Low Cost VMware Fault Tolerance Architecture

While the benefits of Fault Tolerance are substantial, it is often costly and complex to implement. StorMagic SvSAN enables VMware Fault Tolerance out at the edge to enable customer-facing applications to benefit from the same levels of protection previously only available in the datacenter. The joint solution reduces complexities within customer environments, and enables organizations to achieve high resiliency at a low cost of entry.

Our latest white paper, “Using VMware Fault Tolerance with StorMagic SvSAN,” examines an example use case of SvSAN and VMware Fault Tolerance, at the edge, in a multi-site architecture. It explains how deploying two-node SvSAN clusters at over 5000 locations allowed Fault Tolerance to be leveraged without the networking complexities and significant costs that come with it. Download the white paper here to learn more about how you can achieve high availability and eliminate downtime within your environment, with VMware Fault Tolerance and SvSAN.

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