METHOD AND DEVICE FOR DESIGNATING CHECKPOINT FOR CHANNEL RECOVERY IN DATA PROCESSING SYSTEM AND PROGRAM PRODUCT

摘要

PROBLEM TO BE SOLVED: To provide a method, a program product and a device for designating a checkpoint for channel recovery in a data processing system to use a protocol for enabling multiplex operation at a frame level and streaming of a command and data. SOLUTION: When a retrial is not made successful, a correction primary CCW address is reported to software for showing how far the channels have completed the change of an S/390 storage and the access thereto, and then returned.