| 摘要 |
PURPOSE:To reexecute a channel program without informing the generation of a channel fault to software at the time of applying a diagnostic microprogram to an I/O channel generating the channel fault and judging the fault as an intermittent failure. CONSTITUTION:An I/O processor 4 includes a storage means 401 for successively storing a channel program in executing, a channel program reexecution judging flag indicating whether a channel program to be reexecuted has been stored in the means 401 or not, a diagnostic microprogram for instructing diagnosis in each I/O channel, and a means 445 for displaying a diagnostic result in each I/O channel. At the time of detecting an I/O channel fault during the execution of I/O processing described in the channel program, the diagnostic microprogram is applied to the I/O channel, and at the time of judging the fault as an intermittent failure, the stored channel program is reexecuted without informing the generation of the channel fault to the software. |
