Inside Automation Engine > Multi-Server Operation > NonStop Server

NonStop Server

You can use nonstop processes (NWP) in order to increase your system reliability. A specific license is required for this purpose. In nonstop operation, only the WPs of one computer are active. The processes of a different computer (nonstop processes) are available upon request. If the primary computer that includes the active WPs fails, the nonstop processes take over their role. As opposed to a usual parallel operation, the system configurationA set of constituent components that make up a system. This includes information on how the components are connected including the settings applied. NonStop ServerYou can use nonstop processes (NWP) in order to increase your system reliability. A specific license is required for this purpose. In nonstop operation, only the WPs of one computer are active. The processes of a different computer (nonstop processes) are available upon request. If the primary computer that includes the active WPs fails, the nonstop processes take over their role. As opposed to a usual parallel operation, the system configuration NonStop Server does not use the WPs of all computers. The WPs of ony computer are always in the mode "hot standby." [Formerly called "UC4.Nonstop Server."] does not use the WPs of all computers. The WPs of ony computer are always in the mode "hot standby."

The System OverviewThe UserInterface window that contains information about the Automation Engine system. lists all server processes of the AE system. Type "N" processes are nonstop processes and are displayed with the symbol.

The following example describes the functionality of nonstop processes in more detail:

The server processes of an AE system are located on two computers. A work processA part of the component Automation Engine. It is responsible for an Automation Engine system's processes (see also 'Primary work process'). of computer A logs on first and obtains the statusThis represents the condition of a task (such as active, blocked, generating). of the primary work processIt is responsible for the execution of Automation Engine-internal tasks and work processes. (PWP). All other server processes of computer A are set active. All work processes of computer B automatically become nonstop processes. If computer A goes offline, the nonstop processes become active work processes, and one of them obtains the status of a primary work process.

Notes:

Script

Use the scriptA particular Automation Engine object type. element GET_UC_SETTING in order to retrieve a server process type. Return code "N" is supplied if the server process is a nonstop processPart of the component Automation Engine. Nonstop processes assume processing if the computer with the active server processes fails..

See also:

Server processes
Number of server processes

 


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