Abstract: The present invention provides a performance monitoring method of a processing flow that, in a distributed object system, a processing is completed after going by way of processing of several objects through objects. A collector collects, as performance data, a receiving time of a message from the other object and a sending time of a message to the other for an object that becomes a measurement target on each computer. A manager puts received performance data together and calculates and displays a processing time of each object that constitutes a processing flow and a communication time between objects.

Abstract: The present invention provides a performance monitoring method of a processing flow that, in a distributed object system, a processing is completed after going by way of processing of several objects through objects. A collector collects, as performance data, a receiving time of a message from the other object and a sending time of a message to the other for an object that becomes a measurement target on each computer. A manager puts received performance data together and calculates and displays a processing time of each object that constitutes a processing flow and a communication time between objects.

Abstract: The present invention provides a performance monitoring method of a processing flow that, in a distributed object system, a processing is completed after going by way of processing of several objects through objects. A collector collects, as performance data, a receiving time of a message from the other object and a sending time of a message to the other for an object that becomes a measurement target on each computer. A manager puts received performance data together and calculates and displays a processing time of each object that constitutes a processing flow and a communication time between objects.

Abstract: A network management system for managing a network system includes a first data storage device configured to store operation information of a plurality of components of the network system. The operation information provides information about operating states of the components. A display device is configured to provide a temporal tool displaying a plurality of points of time and a component display area to display a plurality of first indications representing the components and a plurality of second indications representing operating states of the components. The pluralities of the first and second indications correspond to one of the points of time selected on the temporal tool. A data processor is configured to process the operation information and transmit data to the display device to display the first and second indications on the display area of the display device.

Abstract: A method and system for detecting fraudulent data update of databases connected to a plurality of distributed computers in which a monitor computer connected via a network to the distributed computers detects fraudulent data update. The monitor computer collects initial data of the databases of the distributed computers via the network to generate parities for data at same storage fields and store them in a monitor database. Each time the databases connected to the distributed computers are updated, a parity update unit of the monitor computer generates new parities from data before and after the update and old parities and replaces the old parities stored in the monitor database by the new parities. At an auditing time, the monitor computer collects latest data of the distributed databases and generates parities which are compared with the corresponding parities already stored in the monitor database to detect an inconsistency of both parities.

Abstract: A disc controller, which is connected to a plurality of channels for supplying access requests and discs. The controller includes a plurality of storage paths which control transfer of data between a cache, the channels and the discs, and a control memory which controls the respective operations of the plurality of storage paths. The control memory stores information which is used to select a storage path in accordance with predetermined standards for storage path selection. A disc or the cache is accessed using the selected storage path.

Abstract: In order for a disk control unit with built-in cache to write non-reflective data in the cache to a disk drive without stopping extension of a read/write command from host computer in the event of a fault in the cache or its backup memory, the track data in normal one of the cache and its backup memory is written to a certain physical track of the disk drive upon judging at read/write command execution that the accessed track is a non-reflective track, and a read/write command from the host computer is implemented for the physical track of the disk drive which has completed the non-reflective track write operation.

Abstract: Herein disclosed is a disk controller having a cache. This cache is so managed that a predetermined part composed of at least one of a plurality parts divided therefrom is initialized. In response to a request for cache activation from a host computer, the initializations of the cache are partly executed in a repeated manner, and a request for disk input/output is intermittently processed so that the whole initializations of a cache having a large capacity can be executed in parallel with the online process.Moreover, the logic failure of the cache and the hardware failure of a memory are divided. When the logic failure occurs, the use of the case is temporarily prohibited, and the whole initializations of the cache are executed automatically at the side of the disk controller without any intervention of a maintenance man so that the cache can be used again.