Abstract: When a get resource message arrives from an exterior, a resource allocation part reserves a resource. In case of data reading or data writing, a declared value management part checks parameters and a slot allocation part allocates the resource, thereby constructing an efficient file system guaranteeing delay quality in relation to data reading. As the result, it is possible to provide a file system providing pictures in a quick response time for requests from users and supporting users requiring various regeneration speeds.

Abstract: When a get resource message arrives from an exterior, a resource allocation part reserves a resource. In case of data reading or data writing, a declared value management part checks parameters and a slot allocation part allocates the resource, thereby constructing an efficient file system guaranteeing delay quality in relation to data reading. As the result, it is possible to provide a file system providing pictures in a quick response time for requests from users and supporting users requiring various regeneration speeds.

Abstract: When a get resource message arrives from an exterior, a resource allocation part reserves a resource. In case of data reading or data writing, a declared value management part checks parameters and a slot allocation part allocates the resource, thereby constructing an efficient file system guaranteeing delay quality in relation to data reading. As the result, it is possible to provide a file system providing pictures in a quick response time for requests from users and supporting users requiring various regeneration speeds.

Abstract: A configuration managing part stores the number of storage devices and respective identifying information. An empty area managing part stores empty-block addresses for each storage device. A destination determining part recognizes the number of storage devices with the information stored by the configuration managing part, and fetches one or more empty-block addresses for specifying empty storage areas included in each storage device from the empty area managing part. The destination determining part then repeatedly rearranges the empty-block addresses at random to determine destination of data.

Abstract: A file system capable of performing bandwidth setting is realized. Further, a bandwidth assuring function and a prefetching function are added thereto, and are organically coupled to a bandwidth setting function, thereby realizing a real-time remote file system. For these purposes, a bandwidth setting request issued by an application 302 is fed to a bandwidth setting part 305 through an extended API 313. The bandwidth setting part 305 sets bandwidths, respectively, for transmission bandwidth control parts 311 and 314 and a prefetching amount control part 310. The transmission bandwidth control parts 311 and 314 and the prefetching amount control part 310 respectively control a transmission bandwidth and control the amount of prefetching on the basis of the bandwidths respectively set.

Abstract: A video server in which each media segment file sever (MSFS) stores media segment files (MSFs) forming video data, and sequence control brokers (SCBs) installed between the video server and subscribers terminals receive video requests from the subscriber terminals, and read out the requested MSFs from the MSFSs. The readout MSFs are exchanged by an ATM switch to be transmitted to the SCBs respectively, which outputs the MSFs at predetermined intervals to the request-sender subscriber terminals.