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Centralized-diagnostic-system-for-loosely-coupled-processors

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Centralized diagnostic system for loosely coupled processors

Details

Inventors: Loges, Barry L.; Sholander, Graciela B.;
Assignee: NCR Corporation (Dayton, OH)
Primary Examiner: Atkinson; Charles E.
Assistant Examiner:
Attorney, Agent or Firm: Stover; James M.

A diagnostic system for a large, multiple processor data processing system. Diagnostic access between dual diagnostic intelligent consoles and each processor is provided through a diagnostic network of communication links and switching nodes which are independent of normal data processing system communication channels. The diagnostic network consists of two embedded three structure communication networks providing two different diagnostic communication paths to each processor within the data processing system.

DETAILED DESCRIPTION There is provided, in accordance with the present invention, a diagnostic system for data processing system having a plurality of processors and data links interconnecting the processors.
The diagnostic system includes a first intelligent diagnostic console for generating and receiving diagnostic messages and a network of diagnostic communication links connecting the intelligent console with each one of the data processing system processors such that at least one communication path is provided between the diagnostic console and each processor.
The diagnostic communication links are dedicated to diagnostic operations and are independent of the data links which interconnect the data processing system processors.
In the described embodiment, the diagnostic network comprises a tree network including a plurality of switching nodes interconnected by diagnostic communication links.
Each switching node is also connected through diagnostic communication links with a group of data processing system processors to form a cluster.
Diagnostic messages are transmitted between the intelligent console, the switching nodes and processors within the clusters utilizing a message packeting protocol.
The intelligent console and processors each include the ability to generate a diagnostic message packet.
The switching nodes each include a control processor and memory containing control software for reading and routing diagnostic message packets through the network.
The diagnostic system is made fault tolerant through the addition of a second intelligent console and additional diagnostic communication links forming a second tree network connecting the second intelligent console with each processor.
Thus, two independent communication paths are provided to each processor.
The above objects and other objects, features, and advantages of the present invention will become apparent from the following detailed specification when read in conjunction with the accompanying drawings in which applicable reference numerals have been carried forward

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