Hitachi, Ltd.

Hitachi Vlsi Engineering Corp.

Other

Hitachi Ulsi Engineering Corp.

Hitachi Engineering Co., Ltd.

Tatsuo Higuchi

Naoki Hamanaka

Shinichi Kawamoto

Shigeo Takeuchi

Junji Nakagoshi

Yoshiko Yasuda

Toshiaki Tarui

Katsuyoshi Kitai

Tatsuru Toba

Jun Okitsu

Atsushi Ebata

Hiroyuki Chiba

Yasuhiro Ogata

Taturu Toba

Satoshi Yoshizawa

Yasuhiro Inagami

Frederico Buchholz Maciel

Machiko Asaie

Shinichi Shutoh

Hideki Murahashi

Masaaki Iwasaki

Teruo Tanaka

Yoshimasa Masuoka

Toshimitsu Ando

Shin'ichi Shutoh

Shinichi Kato

Takayuki Nakagawa

Kiyohiro Obara

Tadaaki Isobe

Masahiro Yamada

Hiroaki Fujii

Yuji Saeki

Patrick Hamilton

Hiromitsu Maeda

Yasuhiro Inagaki

Disclosed are a virtual computer system and method, wherein computer resources are automatically and optimally allocated to logical partitions according to loads to be accomplished by operating systems in the logical partitions and setting information based on a knowledge of workloads that run on the operating systems. Load measuring modules are installed on the operating systems in order to measure the loads to be accomplished by the operating systems. A manager designates the knowledge concerning the workloads on the operating systems through a user interface. An adaptive control module determines the allocation rations of the computer resources relative to the logical partitions according to the loads and the settings, and issues an allocation varying instruction to a hypervisor so as to thus instruct variation of allocations.

Virtual computer systems and computer virtualization programs

A system includes at least a user and a file system connected to the user through a network. An estimated write size of a write operation of the user into the file system is managed as an accumulated value. The timing of judging the limit of the disk usage amount is specified from the accumulated value and a predetermined threshold value, and the limit of the disk usage amount is judged at the specified timing, so that disk usage amount by a user may be limited and managed.

Method of controlling total disk usage amount in virtualized and unified network storage system

A virtualizing file system view method for virtualizing one or more network storage devices into a virtualized file system view network storage system wherein destination network storage information of stored files is compactly held regardless of the number of files, and files are separated into one or more file groups and the file groups managed in destination network storage units. Until now, managing network storage unit information in individual files was necessary however the virtualizing file system view method reduces the management information that must be held and efficiently utilizes network storage capacity without holding destination network storage information in individual files. The cost of rewriting information is also lowered during structural changes such as adding or deleting network storage units since storage destination network information can be rewritten in file groups.

System and method for virtualizing network storages into a single file system view

A system and method for virtualizing a new network storage additionally installed and an existing network storage as a single file system by inheriting a directories tree structure from the existing network storage, wherein a virtualizing system of the new network storage has the function of reading out setup information of the existing network storage according to an expansion request from the administrator, registering the existing network storage as a member of the virtualizing system, copying a directories tree structure of the existing network storage, and swapping setup information of the existing network storage and that of he new network storage with each other.

Changes such as addition or removal of a device in a system composed of a number of devices are automatically detected and the physical location of the devices is managed. A management method of this invention includes a step (S) of detecting the physical location of servers (Sthrough S) connected to a network switch () that is to be monitored, steps (Sand S) of collecting a globally unique MAC address which is unique to equipment of the servers (Sthrough S) connected to the network switch () and is not shared by the equipments, and a step (S) of creating configuration information from the MAC address and from the physical connection location of the network switch ().

System management method for a data center

Disclosed are a virtual computer system and method, wherein computer resources are automatically and optimally allocated to logical partitions according to loads to be accomplished by operating systems in the logical partitions and setting information based on a knowledge of workloads that run on the operating systems. Load measuring modules are installed on the operating systems in order to measure the loads to be accomplished by the operating systems. A manager designates the knowledge concerning the workloads on the operating systems through a user interface. An adaptive control module determines the alalocation ratios of the computer resources relative to the logical partitions according to the loads and the settings, and issues an allocation varying instruction to a hypervisor so as to thus instruct variation of allocations.

In order to execute a flow control and a congestion control in a hop-by-hop manner in a data communication among computers connected to different networks, in a data communication between a client Aand a remote server B, a communication proxy of the remote server B is located in a local server A in an LAN to which the client A belongs. A communication packet to be routed to the remote server B is stolen (received) and passed to a transport layer. A TCP communication between the client Aand the remote server B is divided into two; a communication between the client Aand the communication proxy of the remote server B and a communication between the communication proxy of the remote server B and the remote server B.

Network data communication system

A cache coherence control system for a multi CPU system having a plurality of CPU nodes, memory nodes and I/O nodes interconnected by a network. Each CPU node control circuit has an access right memory for managing an access right of the node in the unit of an extended node larger than a block size of the internal cache of a CPU. When a memory access is performed, the access right memory is referred to, and if the node has an access right to the extended block including a target block, the block is accessed without cache coherence control at other nodes.

CACHE COHERENT CONTROL SYSTEM FOR NETWORK NODES ALLOWS CPU OR I/O DEVICE TO ACCESS TARGET BLOCK WITHOUT CACHE COHERENCE CONTROL, IF ASSOCIATED NODE HAS ACCESS RIGHT IN AN ACCESS RIGHT MEMORY TO TARGET BLOCK

A cache memory unit that preferentially stores specific lines at the cache memory, according to the program nature, dynamically changes the priority ranks of lines, and increases the cache memory hit rate. For this purpose, the lines to be accessed by a processor are divided into groups and definitions of the groups are set in a group definition table; a policy by which to store lines belonging to the groups into the cache memory is set in a policy table; and storing lines into the cache memory is executed, according to the group definitions and the policy of storing set in the tables.

Cache control system

A multiprocessor system can reduce a broadcast for cache memory consistency control with memory access from an I/O device. The multiprocessor system is provided with a cache memory identifier or an owner tag, and a block length table for recording a memory write block length of the I/O device. The cache memory identifier records that the cache has an exclusive copy. The owner tag records that there is no cache memory having an exclusive copy. If there is an exclusive copy during read through the I/O device, a read request is issued to both a cache holding the copy and a memory. If it is recorded that the copy is not present, data are directly read from the memory. Moreover, when a write block length is recorded in the block length table during write, whole blocks are collected to issue a request for invalidation from the cache and the request is directly written to the memory after the invalidation is completed.

Multiprocessor system

A computer system including a plurality of processing nodes, at least one resource provided for use by any of the processing nodes and a plurality of register sets. Each register set is provided in each processing node for storing in parallel use status information indicating whether the resource is in exclusive use status. The computer system includes a plurality of request issue circuits, each being provided in each processing node, for issuing requests for exclusive use of the resource, a message exchanging circuit for serializing requests issued by the request issue circuits into a serialized order and broadcasting the request to the processing nodes and a plurality of status control circuits. Each status control circuit is provided in each processing node to update a corresponding register set depending on use status information and each request received at a corresponding node.

EXCLUSIVE CONTROL METHOD WITH EACH NODE CONTROLLING ISSUE OF AN EXCLUSIVE USE REQUEST TO A SHARED RESOURCE, A COMPUTER SYSTEM THEREFOR AND A COMPUTER SYSTEM WITH A CIRCUIT FOR DETECTING WRITING OF AN EVENT FLAG INTO A SHARED MAIN STORAGE

In order to execute a flow control and a congestion control in a hop-by-hop manner in a data communication among computers connected to different networks, in a data communication between a client A and a remote server B, a communication proxy of the remote server B is located in a local server A in an LAN to which the client A belongs. A communication packet to be routed to the remote server B is stolen (received) and passed to a transport layer. A TCP communication between the client A and the remote server B is divided into two; a communication between the client A and the communication proxy of the remote server B and a communication between the communication proxy of the remote server B and the remote server B.

A computer system including a plurality of processing nodes, at least one resource provided for use by any of the processing nodes and a plurality of register sets. Each register set is provided in each of the processing nodes for storing in parallel use status information indicating whether the resource is in exclusive use status or not. The computer system can also include a plurality of request issue circuits, each being provided in each of the processing nodes, for issuing individually requests for exclusive use of the resource, a message exchanging circuit for serializing requests issued by the request issue circuits into a serialized order and broadcasting the request to all of the processing nodes in the serialized order and a plurality of status control circuits. Each status control circuit is provided in each of the processing nodes corresponding to each of the register sets to update individually a corresponding register set depending on use status information stored in the corresponding register set and each of the requests for exclusive use of the resource received at a corresponding node.

Exclusive control method with each node controlling issue of an exclusive use request to a shared resource, a computer system therefor and a computer system with a circuit for detecting writing of an event flag into a shared main storage

Growing community of inventors

Fuchu, Japan

Tatsuo Higuchi