Information processor and data communication control method capable of preventing problems in data communication caused by breakdowns
AssigneeNEC Corporation
InventorShinjirou Taeshima
Life of this patent
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Abstract
A DGP, upon detecting the occurrence of a fault in an IOP that controls a CH, causes another IOP that can control the CH to control the CH and reports to an EPU the occurrence of the fault in the CH and the recovery from the fault. The DGP stores information in a CH configuration table indicating that the other IOP is controlling the CH. Upon receiving the reports of the occurrence of the fault in the CH and the recovery, the EPU refers to the CH configuration table, verifies that the other IOP is controlling the CH, and provides data transfer instructions to the other IOP.
Claims8
An information processor comprising:
- a channel device connected to an external device;
- a prescribed input/output processor that corresponds to said channel device;
- a specific input/output processor that differs from said prescribed input/output processor;
- a diagnostic processor for, upon detecting a fault of said prescribed input/output processor, placing said specific input/output processor in correspondence with the channel device in place of said prescribed input/output processor, then storing in itself the correspondence relation between the specific input/output processor and the channel device, and then supplying a fault recovery report;
- and
- an arithmetic processor for, when performing data communication with said external device before receiving said fault recovery report, causing said prescribed input/output processor to execute data communication with said external device by using said channel device;
- and when performing data communication with said external device after receiving said fault recovery report, reading said correspondence relation from said diagnostic processor and then causing said specific input/output processor to execute data communication with said external device by using said channel device in accordance with the correspondence relation.
A data communication control method that is implemented by an information processor that includes a channel device that is connected to an external device, a prescribed input/output processor that corresponds to said channel device, and a specific input/output processor that differs from said prescribed input/output processor;
- said data communication control method comprising:
- a diagnostic processing step of, upon detection of a fault of said prescribed input/output processor, placing said specific input/output processor in correspondence with said channel device, storing the correspondence relation between said specific input/output processor and said channel device, and then supplying a fault recovery report;
- and
- a communication step of, when data communication is performed with said external device before receiving said fault recovery report, causing said prescribed input/output processor to execute data communication with said external device by using said channel device;
- and when data communication is performed with said external device after receiving said fault recovery report, causing said specific input/output processor to execute data communication with said external device by using said channel device in accordance with the correspondence relation between said specific input/output processor and said channel device.
Dependencies are inferred from the claim text.