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Browse Prior Art Database

Device Disconnect Procedure for Increased SCSI Bus Throughput

IP.com Disclosure Number: IPCOM000034725D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27

Publishing Venue

IBM

Related People

Authors:
Movall, PE Simonson, DL [+details]

Abstract

A software method is provided by which disconnected status from a small computer systems interface (SCSI) device can efficiently be used by the host system to increase SCSI bus throughput as well as overall system performance. The SCSI standard is local I/O bus developed to provide host systems with a device independent interface within a class of devices. The SCSI standard, ANSI X3.131-1986, provides mechanical, electrical, and functional specifications. It contains provisions for the connection of multiple initiators (SCSI devices capable of initiating an operation) and multiple targets (SCSI devices capable of responding to a request to perform an operation). In a typical system with a local SCSI I/O bus (see Fig. 1), the host (initiator) will issue commands to the various SCSI devices (targets) via the SCSI adapter card.