Browse Prior Art Database

Subsystem Status Indicator

IP.com Disclosure Number: IPCOM000081716D
Original Publication Date: 1974-Jul-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 3 page(s) / 15K

Publishing Venue

IBM

Related People

Loughlin, MP: AUTHOR [+2]

Abstract

There is described herein a subsystem status indicator which provides to an operator of a computer installation, information relative to the status of an independent subsystem for control units.

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Subsystem Status Indicator

There is described herein a subsystem status indicator which provides to an operator of a computer installation, information relative to the status of an independent subsystem for control units.

The need for such indicator arises from the fact that, generally, in a computer installation where there are a number of control units and subsystems which are located either remotely or are concealed from the operator, information as to the connection and operating status of the control units and/or subsystems is generally not available. Thus, only when a major failure of the control units and/or subsystems significantly impacts the operation of the central processor, does the operator become aware of the problem. Even in the latter situation, the operator may only be aware that a problem exists without knowing the source of the problem.

The subsystem status indicator described herein comprises respective status reporters for each control unit and/or subsystem within the computing configuration, these reporters being located at the operator's station. Associated with each control unit or subsystem is an array of several indicator lights, suitably four.

A first indicator on a status reporter for a particular control unit or subsystem indicates whether or not it is operating normally in the configuration, such normal operation suitably being represented by a first closed indicator light color. In the case of a subsystem which is a dependent or independent CPU and which is software driven, the first indicator light is illuminated by the pulsing of an output line at specific time intervals such as 30 seconds, for example. The pulse on the latter output line functions to reset a timer. If the subsystem fails to reset the timer within twice its normal interval, then such indicator light signal will be extinguished and a second indicator light is illuminated.

In the situation of a control unit, which is CPU dependent and consists solely of hardware, the first indicator light is illuminated whenever the control unit parity and/or error lights have not been activated for more than a specific period of time such as 60 seconds, for example, or whenever none of the other indicators are illuminated. Should the first indicator light be illuminated, then the other three light indicators in the array of four lights for the particular unit or subsystem are inhibited. The status of the first indicator light is also controlled by conditions which control the other indicator lights on the panel of the status indicator for the particular unit.

The second light indicator on the status reporter for a control unit or subsystem is employed to indicate that the particular unit is beginning to fail, or is intermittently failing, the second indicator light being chosen to have a second chosen color. As identified for the first indicator in a CPU or subsystem, the second indicator light is illuminated when a reset pulse for continuing the i...