IBM RSCT

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RSCT (Reliable Scalable Cluster Technology) is a set of software components that together provide a comprehensive clustering environment for AIX and Linux. RSCT is the infrastructure used by a variety of IBM products to provide clusters with improved system availability, scalability, and ease of use. It follows a list of main RSCT components:

the Resource Monitoring and Control (RMC) subsystem. This is the scalable, reliable backbone of RSCT. It runs on a single machine or on each node (operating system image) of a cluster and provides a common abstraction for the resources of the individual system or the cluster of nodes. You can use RMC for single system monitoring, or for monitoring nodes in a cluster. In a cluster, however, RMC provides global access to subsystems and resources throughout the cluster, thus providing a single monitoring/management infrastructure for clusters. It is used for HMC DLPAR, sfp, invscout ...
the RSCT core resource managers. A resource manager is a software layer between a resource (a hardware or software entity that provides services to some other component) and RMC. A resource manager maps programmatic abstractions in RMC into the actual calls and commands of a resource.
the RSCT cluster security services, which provide the security infrastructure that enables RSCT components to authenticate the identity of other parties.
the Topology Services subsystem, which, on some cluster configurations, provides node/network failure detection.
the Group Services subsystem, which, on some cluster configurations, provides cross node/process coordination.