Abstract: An observation system includes a first sensor configured to observe a first portion of an observation target, a second sensor configured to observe a second portion of the observation target, and a control device including a memory and a processor coupled to the memory, the processor being configured to receive first observation data from the first sensor via a first relay device and second observation data from the second sensor via a second relay device, wherein the first observation data is not transmitted from the first sensor to the second relay device when the first observation data is transmitted from the first sensor to the control device via the first relay device, and the second observation data is not transmitted from the second sensor to first relay device when the second observation data is transmitted from the second sensor to the control device via the second relay device.

Abstract: An observation system includes a first sensor configured to observe a first portion of an observation target, a second sensor configured to observe a second portion of the observation target, and a control device including a memory and a processor coupled to the memory, the processor being configured to receive first observation data from the first sensor via a first relay device and second observation data from the second sensor via a second relay device, wherein the first observation data is not transmitted from the first sensor to the second relay device when the first observation data is transmitted from the first sensor to the control device via the first relay device, and the second observation data is not transmitted from the second sensor to first relay device when the second observation data is transmitted from the second sensor to the control device via the second relay device.

Abstract: A method of restoring data coherency is disclosed, whereby a duplex shared memory subsystem quickly recovers from a failure of one of the duplexed memory pair. A cluster first divides the duplex shared memory subsystem into segments each of which is a unit for copying. After synchronizing itself with other operating clusters, the cluster initiates a coherency restoration process to be performed in cooperation with all other operating clusters, sharing the jobs related to the segments. This results in reducing the time required for the coherency restoration process where the system must operate in an unreliable, coherency-lacking situation.

Abstract: A control method and system for preventing the incorrect resetting of a common resource in a multicomputer system comprising a plurality of clusters each having a processor and a common memory which each cluster can access. The method includes steps of storing in a common memory an IPL (initial Program Load) generation ID (Identifier) which is unique to an IPL number of each cluster, setting an acquisition ID and the IPL generation ID in the common resource, when the right to use the common resource in the common memory is acquired, and comparing the IPL generation ID when the faulty cluster stops, with the IPL generation ID set in the common resource, and only when the two IPL generation IDs are equal, resetting the right to use the common resource, when the right to use the common resource which the stopped faulty cluster acquires is reset.