Browse Prior Art Database

Initial Program Load on a Peer Ring

IP.com Disclosure Number: IPCOM000034980D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Hall, WD: AUTHOR [+2]

Abstract

This article describes a technique for supporting a request for initial program load (IPL) from a facility on a peer ring when the source node is unknown. In the technique disclosed herein a specific broadcast command is defined to allow any node within a distributed data processing (DDP) system to request an IPL with no knowledge of the source node. This broadcast frame will be generated automatically by the attachment whenever a Request IPL signal is generated by the processor. The argument sent with the request could be the processor identification, a label for a specific data volume or a logical name defined by program conventions. All nodes will accept the frame and the one that compares positively with the argument will then transmit the IPL data.

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Initial Program Load on a Peer Ring

This article describes a technique for supporting a request for initial program load (IPL) from a facility on a peer ring when the source node is unknown. In the technique disclosed herein a specific broadcast command is defined to allow any node within a distributed data processing (DDP) system to request an IPL with no knowledge of the source node. This broadcast frame will be generated automatically by the attachment whenever a Request IPL signal is generated by the processor. The argument sent with the request could be the processor identification, a label for a specific data volume or a logical name defined by program conventions. All nodes will accept the frame and the one that compares positively with the argument will then transmit the IPL data. In a DDP system, such as the one disclosed in *, a Broadcast Processor Reset order is used to inform each drop to terminate all processing of operations destined to the port, clear all interrupts destined to the port, clear all drop control data associated with the port, and clear all status and error logs associated with the port which issued the order. There is no data associated with this order. An IPL Data order is used to send part of the IPL data that was requested by a port. The IPL data is sent to the system using a storage address of zero plus the address displacement in the order. This order would be used to respond to an Initiate IPL order. An IPL Data and Interrupt o...