High-availability cluster computing

OpenVMS, often referred to as just VMS, is a multi-user, multiprocessing and virtual memory-based operating system. It is designed to support time-sharing, batch processing, transaction processing and workstation applications. Customers using OpenVMS include banks and financial services, hospitals and healthcare, telecommunications operators, network information services, and industrial manufacturers. During the 1990s and 2000s, there were approximately half a million VMS systems in operation worldwide.

load balancing software

computer networking protocol; allows multiple hosts on the same local area network to share IP addresses; provides failover redundancy, especially with firewalls and routers

cluster of separate computers designed for high availability at the application level (even if individual nodes fail)

concept in computing

Clustering software from IBM

The Linux-HA (High-Availability Linux) project provides a high-availability (clustering) solution for Linux, FreeBSD, OpenBSD, Solaris and Mac OS X which promotes reliability, availability, and serviceability (RAS).

cluster of IBM mainframes

high-availability cluster software