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Diagnostic Method for Computer Systems

IP.com Disclosure Number: IPCOM000088128D
Original Publication Date: 1977-Apr-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 3 page(s) / 73K

Publishing Venue

IBM

Related People

Charon, JE: AUTHOR [+3]

Abstract

The Good Machine Path (GMP) is a diagnostic method useful in a computer system to detect hardware failures. The method is based on first determining the failing device and then attempting to recreate the failure. The GMP Maintenance Analysis Procedure (MAP) (Fig. 1) provides an orderly method of diagnosing a failure and entry to the correct Field Replaceable Unit (FRO) isolation MAP. This provides high resolution of solid failures, and by use of various options, a high probability of resolving intermittent failures. It also permits initial problem determination using the same directed procedure for both solid and intermittent failures, and at the same time it identifies which type of failure is occurring.

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Diagnostic Method for Computer Systems

The Good Machine Path (GMP) is a diagnostic method useful in a computer system to detect hardware failures. The method is based on first determining the failing device and then attempting to recreate the failure. The GMP Maintenance Analysis Procedure (MAP) (Fig. 1) provides an orderly method of diagnosing a failure and entry to the correct Field Replaceable Unit (FRO) isolation MAP. This provides high resolution of solid failures, and by use of various options, a high probability of resolving intermittent failures. It also permits initial problem determination using the same directed procedure for both solid and intermittent failures, and at the same time it identifies which type of failure is occurring. Additional options and capabilities are provided for failures that require support assistance or freelance-type diagnosis.

The GMP is all soft copy Map Diagnostic Integration (MDI), and once initial setups are made, is noninteractive with the Customer Engineer (CE). The GMP exercises all functions of the device subsystem, preferably in a building approach.

The system entry MAP will direct the CE through a basic system checkout and then, if the failing device is known, provide an option to go directly to the GYP MAP. If the device is unknown, the CE may use Error Recording Edit and Print (EREP) or an Error Log Analysis (ELA) MAP to identify the failing device from previously logged error data. One further method of identifying the device is to perform a system test to log more error data. (Error data does not log when failures occur during diagnostic mode, such as in a MAP.)

If the CE chooses the GMP MAP, he will automatically go through a MAP, as shown on Fig. 2 (with controls as shown in Fig. 1). The GMP shown in this example starts with Device X, continues through A1, A2, A3, B1, C1, D1, E1, and ends with the Good Machine Exit (GME). Various types of steps are shown in the Fig. 2 example, as follows: - A1 shows a step which calls another MAP (A2), and, if no failure occurs while running routines at A2 and A3, will return from A3 to A1 and then continue to the next step. - B1 shows a step where the exit from the GMP is directly to a hard copy MAP (S). - C1 shows a step where a failure on the GMP will continue in soft copy, with a tie in to hard copy, if needed. - D1 shows a step where a failure on the GMP points directly t...