Dismiss
The InnovationQ application will be updated on Sunday, May 31st from 10am-noon ET. You may experience brief service interruptions during that time.
Browse Prior Art Database

Allocating Paths to Queued I/O Requests

IP.com Disclosure Number: IPCOM000049968D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-09

Publishing Venue

IBM

Related People

Authors:
Easton, MC [+details]

Abstract

This invention relates to a method for allocating path availability to queued I/O requests accessing a common device to which a state variable (activity number) counterpart to each path is incremented when a Start I/O (SIO) issues over that path and is decremented when a channel program is completed. The method contemplates that if at least two paths are free, then the path having the lowest number is assigned. Further, in the event that only one path is free, this path is assigned only if its new activity number following the assignment will not exceed a threshold that depends on both the activity number on another channel and on a parameter THRESH.