When I/Os are performed continuously for an LU whose paths are all Offline(E), Online(E), Online(S), Online(D), or Offline(C) because of a failure such as a broken wire, the number of times that an error occurs (the IEP value when "dlnkmgr view -path -iem" is executed) during intermittent error monitoring might increase even though the automatic failback function did not recover some paths. In such a case, even though an intermittent error did not occur, HDLM often assumes an intermittent error, and excludes paths from the automatic failback function. In such a case, after recovery from the failure, to change the status of a path excluded from automatic failback to online, manually change the status to online.