1. Machine types

    Article: AN0002436Updated: 31.05.2020

    There are various machine types recorded in the Machine (OS Server) entity - e.g. Servers (physical and virtual), Clusters, Farms, Cluster services. Particular objects are represented by a corresponding record in the class Machine with a selected Machine type.

    Fundamental Machine types

    Type Description
    Server Physical (native) server installed on Hardware or Virtual server running on a cluster of virtualization platform. They are distinguished by the property Physical on and Virtual on. Physical server refers in the property Physical on to a Device and Virtual server refers in the property Virtual on to another record of the entity Machine (OS Server) - cluster of virtualization platforms.
    Cluster Group of Servers running in active/passive (failover) or active/active mode and providing resources for Cluster services or Virtual servers.
    Farm Group of identical servers which are accessed by some load balancing technology. All the servers in the farm provide identical services and are mutually interchangeable. Load balancer distributes requests from clients to particular servers of the farm. An example is e.g. Citrix farm or web server farm. Assignment of a server into the farm is captured in the property Member of farm/cluster.
    Cluster service Cluster service utilizes resources of servers (nodes) belonging to the Cluster. In case of failure of the node, on which the cluster service is running, the service is migrated to another server (node), that is also member of the cluster. We can distiguish Current node, on which the service is running at the moment, Failover node, to which the service should be migrated in case of current node failure and Preferred node, on which the service should run, if it is possible. The assignment of Cluster service to the Cluster is captued in the Cluster service record in the property Virtual on, where a Cluster record should be selected.