Hitachi, Ltd.

Hiroshi Yashiro

Hideki Murayama

Takehisa Hayashi

Kazuo Horikawa

Masahiko Yamauchi

Satoshi Yoshizawa

Daisuke Sasaki

Yasuhiro Ishii

Kimitoshi Yamada

Hiroshi Iwamoto

Masahiro Kitano

Hirofumi Fujita

Toru Horimoto

Tsutomu Goto

Akira Kito

An information processing apparatus for allowing a memory to be added thereto while being powered. The apparatus comprises a processor, a first main memory initially connected, and a connecting switch. The switch connects the processor, the first main memory, and a second main memory to be added. Main memory management information in the first main memory includes the size of memory resources connected to the processor. A storage region in the connecting switch retains information about whether or not the processor is connected to each of the memories. The setup allows the apparatus to use the added memory without having to be restarted.

Information processing apparatus

Memory managing method used in adding memory and information processing apparatus

A computer system having a plurality of computers connected to each other by a computer coupling mechanism. Each computer includes a processor, memory, I/O device, disk control mechanism, computer coupling network adapter, disk requirement processing section connected to a system bus, and a disk connected to a disk control mechanism. The disk requirement processing section controls the disk, in response to a processing requirement for the disk from one of the processors of the other computers, based on structural definition information. The structural definition information describes a structure of the computer system. The computer system may be a loosely-coupled computer system.

Computer system having a plurality of computers each providing a shared storage access processing mechanism for controlling local/remote access to shared storage devices

Before transferring data, a transmitting computer acquires a transfer rate of an I/O bus to which a communication control device in a receiving computer is connected. When transmitting data, the communication control device refers to a connection control table and a receiver control table, and chooses a transmitting queue for data transmission from a plurality of transmitting queues so that an interval is inserted between transmissions of data, and the data can be transmitted to the receiving computer without loss. The transmission intervals of data are determined based on the transfer rate of the I/O bus to which the communication control device in the receiving computer is connected.

Communication control device transmitting data based on internal bus speed of receiving computer

A control method of controlling a computer for controlling a resource connected to the computer and shared by a plurality of programs included in the computer includes the steps of storing a control information ID indicating a storage area in the main memory storing control information concerning access between a certain program and the resource in an OS space of a main memory, storing the control information ID in an adaptor connected to the main memory via a bus, and taking out the control information from the storage area included in the OS space, by using the control information ID stored in the adapter. In the case where the adapter runs short of a storage area, information that the adapter runs short of a storage area in the main memory is conveyed via the bus. By using the control information thus taken out, the resource is controlled.

Method and apparatus for controlling resource

A memory disc sharing method in which a plurality of computers share a memory disc through a network, wherein a command in accordance with which the memory disc is accessed is received by a network interface apparatus, and when a requested computer to which a request of the command has been made is any of other computers, the command is transmitted to the any of other computers, and when the requested computer is a computer concerned, the command is stored in a memory disc command queue. The network interface apparatus retrieves the command from the memory disc command queue, and executes the processing of reading out/writing data from/to the memory disc in the computer concerned when a requesting computer from which a request of the command has been made is the computer concerned, and carries out the data transfer between the memory disc in the computer concerned and the requesting computer when the requesting computer is any of other computers.

Memory disk sharing method and its implementing apparatus

Computer system having a plurality of computers each providing a shared

A distributed shared memory management system for a distributed shared memory computer system having a plurality of computers interconnected by a network, each computer having an independent address space and logically sharing data physically distributed to a storage of each computer. Each computer running a program for reading/changing the shared data includes a coherence control designation command for designating to enter a mutual exclusion state in which two or more computers cannot change the logically single shared data, a coherence control release command for designating a release of the mutual exclusion state, and a coherence control execution command for reflecting the contents of the shared data changed between the coherence control designation command and the coherence control release command, upon the logically single shared data in another computer. At least one of the plurality of computers includes a request message queue for storing a coherence control request message issued by the coherence control execution command when the coherence control designation command is executed. The coherence control designation command includes data for designating the order of reading/changing the shared data, and the request message queue includes a counter for storing a current state regarding the control of the order of reading/changing the shared data and a unit for storing a value regarding the control of the order of reading/changing the shared data.

Distributed shared data management system for controlling structured

Growing community of inventors

Kawasaki, Japan

Hiroshi Yashiro