公开(公告)号：CA1168365A

公开(公告)日：1984-05-29

申请号：CA397742

申请日：1982-03-05

Applicant: IBM

Inventor： BEARDSLEY BRENT C ,  BRAILEY ALLEN C

IPC: H04L1/00 ,  G06F11/00 ,  G06F11/20 ,  G06F11/34 ,  G06F12/16 ,  G06F13/00 ,  H04L1/20

Abstract: A hierarchical communication system has multipaths for different levels of the hierarchy, each set of paths is assigned a criticalness to the successful operation of the system. Error races for all of the paths are monitored. A threshold for defining an unusable data path is based upon the criticalness of the path to successful operation. That is, the more critical the path, the higher the error rate that will be sustained. A specific embodiment employs shift-registers for indicating the error rate of the last predetermined number of usages of the given paths. A mass storage system employing the error-rate system is described. TU981008