One of the most efficient approaches to resilience enterprise-critical server is the use of server clusters. Clusters consist of a group of servers, each of which operates redundant virtual machines. If a server fails, the clustering software removes it from the cluster. At the same time, copies of the virtual machines start up and the user ideally does not notice a fault. One of the key benefits of clustering is that the cluster’s servers often do not need high-reliability features. Control is simply assigned to another server in the cluster.
A year back I heard of company Stratus and from Rockwell Automation and found Stratus FTServer best server for 99.99999% uptime, but this is the solution is hardware level, to achieve application-level high availability, the same company is having best tool everRun which supports synchronized copies of selected workloads on different servers. If the original workload is interrupted, the duplicate will start up and become active with minimal disruption (if any). Even though this is not a cluster in the true sense of the term, redundancy will bring you to the level of true clustering.
There are other variants that pursue this idea. Hypervisors such as VMware offer high availability tools. These are able to start affected virtual machines on another server. The workload may be temporarily disrupted due to the startup process. However, this type of automation helps a company address workload issues with appropriate applications.
These are just a few examples of software options that can help you with high availability for key enterprise workloads. Administrators must consider these tools in relation to the benefits. Afterward, make sure that virtual machines are sufficiently protected.