摘要:
A computer system, which is intended for easy introduction of architectures and fundamental softwares used by users, includes one or more first computers which implement the user interface function, one or more second computers which run application programs, and a third computer which administrates the first and second computers. A first computer turned on by a user operates on the third computer to assign a second computer for running a fundamental software which controls the execution of a user's application program. The assignment of a computer which runs the fundamental software for the user's application program at the time of user request facilitates the introduction, administration and operation of fundamental softwares and computers.
摘要:
A disc array system has a plurality of disc storage devices (i.e., drives) constituting a parity group and mounted in a distributed manner on different boards. Where any one drive in the same parity group develops a fault, the board carrying the faulty drive is withdrawn from the mother board for repair. If the CPU issues a write request for data held in the faulty drive or in any normal data on the same board, the requested data is recovered from the multiple data retained in the other drives constituting the same logical group and mounted on the other boards. The recovered data is sent to the CPU. If the CPU supplies write data to the faulty drive or to any normal drive on the same board, the supplied write data is held temporarily in a cache memory in an array controller. Later, when the board is repaired and replaced onto the mother board, the data to be held in the alternate drive having replaced the faulty drive is recovered from the data in the other drives, and the recovered data is written to that alternate drive. Then the write data in the cache memory is written to the alternate drive or to the target normal drive.
摘要:
A mode register stores a mode bit for each of the general registers, an access circuit accesses the general registers and the mode register so that a general register designated by an instruction and a corresponding mode bit are read out together. A data use circuit or a data supply circuit connected to the general registers includes a circuit portion which effectively changes the significant bit length of the data read out of the designated general register or of the data to be written into the designated general register.
摘要:
The computer system provides a processing unit and normal-use and stand-by main storage units, pre-loads an application program and a control program required for executing the application program in both of the main storage units, in a normal operating time, functions the normal-use main storage unit only as the main storage under the control of the processing unit, executes the control program and the application program stored in the normal-use main storage unit, in a software-fault occurring time, functions the stand-by main storage unit only as the main storage unit under the control of the processing unit, and executes the control program and the application program stored in the stand-by main storage unit. Then, a recovery program contained in the application program stored in the stand-by main storage unit serves to recover the state of the application program into the state before fault occurs. Next, the application program is kept being executed or re-started from the head of the application program.
摘要:
An information processing system including a group of translation tables in a multilevel structure for achieving address translation from a virtual address into a real address, a control register for keeping a starting point address data of a translation table located at a highest level among the address translation tables and a level data indicating a level (n) of the translation table at the highest level among the group of translation tables, and a unit for sequentially accessing the address translation tables at levels lower than the level (n) indicated by the level data in the control register based on the starting point address data and a virtual address to be translated, thereby translating the virtual address into a real address.
摘要:
An extended address translation equipment wherein an address translation buffer has entries each provided with a record of translation table addresses of each level, thereby eliminating the need for accessing the translation table up to a portion consistent with the virtual address.
摘要:
In order to perform format conversion between the formats of a plurality of files without any work by a user, a file system stores a relation between a conversion originating file and a conversion destination file, and synchronously with an issue of a file operation API, the format conversion processes are executed. A user performs only the tasks essential for an application, without taking into consideration various necessary format conversions (either one-step or multi-step). During the user task, it is not necessary to designate a conversion originating file and a timing of format conversion. A user can use always a latest conversion destination file.
摘要:
Irregular and unstable natures of the Internet to be caused by an increase in Internet accessing users are alleviated and services of an information system more comfortable to users are provided. To this end, each servers among a plurality of servers cooperating to provide services stores the past communications line state (throughput and latency), and in accordance with the stored communications lines state, cache reference and prefetch are preformed between optional servers.
摘要:
A plurality of disc units, an array control unit, and a host controller connecting mechanism for connecting them to a host controller through a system interface are mounted on the same circuit board. The order of interrupts of requests for connecting of disc units is detected, and the disc units are connected to a common bus selectively. Cables for interconnecting constituent elements of the disc array device and supporting mechanisms for the disc units can be dispensed with, and consequently the cost can be reduced. Useless rotation waiting is avoided, improving the data transfer rate. The disc array device can be built in the host device and connected directly to the system bus. Therefore the ease of operation can be improved.
摘要:
In a data processing system to which a large number of disk drive units are connected, data in the whole or part area of a file are multiplexed and distributed into a plurality of disk drive units when the file is opened, and the multiplex data of the file are deleted when the file is closed. Among the multiplex data, data shortest in access time or striped data shortest in transfer time is selected to be accessed. When data multiplexing is applied only to the part area, the data storage capacity of the system can be reduced more remarkably.