Browse Prior Art Database

Iop/Ioa Bus Isolation During Operational Mode

IP.com Disclosure Number: IPCOM000034433D
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Bilder, MM: AUTHOR [+3]

Abstract

This article describes a technique that incorporates an isolation algorithm at operational time which will isolate a failing field replaceable unit (FRU) because of input/output adapter (IOA) bus problems on the input/output processor (IOP). Typically, there is no IOA bus isolation for failures on the IOA bus during operational mode and the whole IOP subsystem is suspect. The incorporation of an isolation algorithm at operational time will isolate the failing FRU due to IOA bus problems. Fig. 1 illustrates the IOP-IOA hardware in block diagram. At operational time if there is an IOA bus error, the subsystem is at a standstill. The IOP will shutdown the IOA bus via hardware aids that degate critical interface lines so that the IOP microcode can now reeestablish communications with the system.

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Iop/Ioa Bus Isolation During Operational Mode

This article describes a technique that incorporates an isolation algorithm at operational time which will isolate a failing field replaceable unit (FRU) because of input/output adapter (IOA) bus problems on the input/output processor (IOP). Typically, there is no IOA bus isolation for failures on the IOA bus during operational mode and the whole IOP subsystem is suspect. The incorporation of an isolation algorithm at operational time will isolate the failing FRU due to IOA bus problems. Fig. 1 illustrates the IOP-IOA hardware in block diagram. At operational time if there is an IOA bus error, the subsystem is at a standstill. The IOP will shutdown the IOA bus via hardware aids that degate critical interface lines so that the IOP microcode can now reeestablish communications with the system. The IOP will request the download of an isolation algorithm that will interrogate the IOA bus and IOAs to determine what is the failure. The algorithm will degate all the IOAs on the IOA bus, open up the IOA bus and see if the bus is now operational. If the bus is now functional, each IOA will be tested to find the error and, if more than one IOA is bad, then the IOP will be the error FRU. Fig. 2 is a flow chart of the isolation algorithm.

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