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High-availability clusters (also known as HA clusters, fail-over clusters) are groups of computers that support server applications that can be reliably utilized with a minimum amount of down-time. They operate by using high availability software to harness redundant computers in groups or clusters that provide continued service when system ...
10 hosts, each having 50% availability. But if they are used in parallel and fail independently, they can provide high availability. So for example if each of your components has only 50% availability, by using 10 of components in parallel, you can achieve 99.9023% availability. Two kinds of redundancy are passive redundancy and active redundancy.
Enable active/standby communication (notably Checkpointing): Active subsystems need to communicate to standby subsystems to ensure that the standby is ready to take over where the active left off. High Availability Software can provide communications abstractions like redundant message and event queues to help active subsystems in this task.
Active Directory (AD) is a directory service developed by Microsoft for Windows domain networks. Windows Server operating systems include it as a set of processes and services. [1] [2] Originally, only centralized domain management used Active Directory. However, it ultimately became an umbrella title for various directory-based identity ...
One of the more prevalent multi-master replication implementations in directory servers is Microsoft's Active Directory. Within Active Directory, objects that are updated on one Domain Controller are then replicated to other domain controllers through multi-master replication. It is not required for all domain controllers to replicate with each ...
The Red Hat Cluster Suite (RHCS) includes software to create a high availability and load balancing cluster. Both can be used on the same system although this use case is unlikely. Both products, the High Availability Add-On and Load Balancer Add-On, are based on open-source community projects. Red Hat Cluster developers contribute code ...
Pages in category "High-availability cluster computing" The following 21 pages are in this category, out of 21 total. This list may not reflect recent changes .
Microsoft Entra ID (formerly known as Microsoft Azure Active Directory or Azure AD) is a cloud-based identity and access management (IAM) solution. It is a directory and identity management service that operates in the cloud and offers authentication and authorization services to various Microsoft services, such as Microsoft 365, Dynamics 365, Microsoft Azure and third-party services. [1]