Influence range specifying method, influence range specifying apparatus, and storage medium

An influence range specifying method executed by a processor included in an influence range specifying apparatus, the influence range specifying method comprising:

• determining a communication path between two devices with a correlation in use status of resources as an information transmission path based on system configuration information indicating a coupling relationship between a plurality of devices included in a network and based on use resource information indicating temporal variation in the use status of the resources of each of the plurality of devices;
• generating, for each of a plurality of software, an influence propagation model in which a direction from a first device on the information transmission path to a second device adjacent to the first device is set as an influence propagation direction of a failure of the software in the information transmission path, when a co-occurrence probability indicating a probability that the second device outputs a message through execution of the software within a certain time after the first device outputs a message through execution of the software is equal to or greater than a threshold, based on a message log storing messages output by the plurality of devices through execution of the plurality of software, respectively;
• acquiring failure information indicating a failed device in which a failure occurs in one of software among the plurality of software;
• specifying, as an influenced device influenced by the failure in the failed device, a device reached by tracing the information transmission path from the failed device in the influence propagation direction indicated in the influence propagation model of the one of software;
• and
• outputting information indicating the influenced device.

An influence range specifying apparatus, comprising:

• a memory;
• and
• a processor coupled to the memory and configured to
• store system configuration information indicating a coupling relationship between a plurality of devices included in a network, use resource information indicating temporal variation in use status of resources of each of the plurality of devices, and a message log storing messages output by the plurality of devices through execution of the plurality of software, respectively,
• determine a communication path between two devices with a correlation in the use status of the resources as an information transmission path based on the system configuration information and the use resource information of each of the plurality of devices and generate, for each of the plurality of software, an influence propagation model in which a direction from a first device on the information transmission path to a second device adjacent to the first device is set as an influence propagation direction of a failure of the software in the information transmission path, when a co-occurrence probability indicating a probability that the second device outputs a message through execution of the software within a certain time after the first device outputs a message through execution of the software is equal to or greater than a threshold, based on the message log,
• acquire failure information indicating a failed device in which a failure occurs in one of software among the plurality of software,
• specify, as an influenced device influenced by the failure in the failed device, a device reached by tracing the information transmission path from the failed device in the influence propagation direction indicated in the influence propagation model of the one of software, and
• output information indicating the influenced device.