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| Secure electronic mail system |
| OF THE PREFERRED EMBODIMENTS In accordance with one exemplary embodiment of the present invention ... |
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| Method for managing concurrent processes using dual locking |
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| Complex document security |
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| Method and system for restricting access to the private key of a user in a public key infrastructure |
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Method for authenticating messages passed between tasks
| Details |
Inventors: Glowny, David A.; Shih, Jenngang; Carr, Brian P.;
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Examiner: Swann; Tod R.
Assistant Examiner: Darbe; Valerie
Attorney, Agent or Firm: Kinnaman, Jr.; William A., Neff; Lily
A system for providing distributed control of a resource with centralized configuration management. A network of distributed workstations is provided for controlling a resource such as a large mainframe computer. Server workstations for applying control commands to the resource are attached to each resource, preferably through redundant connections. Remote client consoles are defined which may be connected to the server for control of that resource. Server and resource location and primary and fallback connection paths are maintained by a centralized control server. Upon client console request, the central control server causes the server workstation associated with a particular resource to establish a control session between the server and the client console. A record of each dynamic connection is maintained by the central control server. Upon failure of a client console, the server accesses central server fallback information and establishes a fallback connection with an operational client console. Failure of a server workstation causes the resource to establish a link with a backup server which is then able to recover all sessions with client consoles by accessing the dynamic configuration database of the central controller. Configuration data may be updated dynamically taking effect when the next request for establishment of a session is made. In an alternate embodiment, interprocess security is optionally implemented in control servers and hardware resource servers. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The preferred embodiment of the present invention is implemented to control hardware resources, and in particular, to control the operation of a mainframe computer system such as the IBM 3090 computer system (IBM and 3090 are registered trademarks of the IBM Corporation).
It will be recognized, however, that the system of the present invention can be used to control other resources which require operator interaction including resources such as a production assembly line, chemical processing facility, or building environmental system.
The structure of a system according to the present invention is shown generally in FIG.
1.
Resources to be controlled are identified generally at 102, 104, and 106.
It will be recognized that this system is applicable to any number of resources and the example of three is shown for illustrative purposes only.
Each resource is connected to at least one server workstation.
Server workstations are shown at 108, 110, and, 112.
These workstations are an intelligent device such as an IBM Personal System/2 computer system (PS/2) (Personal System/2 and PS/2 are registered trademarks of the IBM Corporation).
The servers are connected to hardware resources by communication lines 114, 116, 118, 120 and 122.
In the preferred embodiment, a resource typically is connected to more than one server to provide a fallback control path.
For example, resource 102 is connected via communication path 114 to server 108 and by communication path 116 to server 110.
A client workstation 130 (such as an IBM PS/2 computer system) is provided as a console for operator use.
The client workstation manages the operator interaction including the presentation of messages to the operator and the generation or acceptance of commands for controlling the hardware resource.
The separation of client and server functions allows a balancing of workload between the devices.
It also allows a single client console to manage a number of hardware resources
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