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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 ...
Availability zones are typically geographically separated from one another, to prevent local disasters from acting on more than one availability zone. Some service providers also make higher-level regional distinctions between availability zones, allowing service providers to mitigate even regional-level disasters such as earthquakes and forest ...
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.
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.
Active Directory features an additional capability that both NDS and VINES lack, its "forest and trees" organizational model. The combination of better architecture and with marketing from a company the size of Microsoft doomed StreetTalk, VINES as an OS, and finally Banyan itself.
The hierarchical Domain Name System for class Internet, organized into zones, each served by a name server. Administrative responsibility for any zone may be divided by creating additional zones. Authority over the new zone is said to be delegated to a designated name server. The parent zone ceases to be authoritative for the new zone. [23]: §4.2
In Microsoft Windows networks domain controllers register their network service types for Active Directory in the DNS. An older version of the Internet Draft for OpenPGP Web Key Directory uses SRV records for discovering OpenPGP keys through web servers. [22] Usages of SRV records are no longer part of the Internet Draft in later versions. [23]
Veritas Cluster Server (rebranded as Veritas Infoscale Availability [1] [2] and also known as VCS and also sold bundled in the SFHA product) is high-availability cluster software for Unix, Linux and Microsoft Windows computer systems, created by Veritas Technologies.