Hitachi, Ltd.

Frederico Buchholz Maciel

Toshiaki Tarui

Shinji Fujiwara

Satoshi Yoshizawa

Tatsuo Higuchi

Katsuyoshi Kitai

Kazutomo Ushijima

Daisuke Ito

Hideki Murahashi

Naoki Watanabe

Yoshimasa Masuoka

Itaru Nishizawa

Nobutoshi Sagawa

Mamoru Sugie

Shigekazu Inohara

Toru Shonai

Aki Tomita

Hiroaki Odawara

Shin Kameyama

Yutaka Yoshimura

A shared-nothing database management system employs a method of adding and removing a database server without significantly affecting the processing performance for accessing a table from a user or an application. A scheduler module creates a schedule which separately handles the addition of a CPU resource and the addition of a storage I/O resource, and a server is added in accordance with the created schedule. A common disk is used to remove a disk at an arbitrary timing. Further, a data region is previously subdivided on the common disk to eliminate a movement of data associated with the addition of a server.

Method of changing system configuration in shared-nothing database management system

The present invention improves input/output speed by multiplexing/demultiplexing data and also reducing the processing time required for interrupt handling. The present invention involves a process which requests input/output operation; an adapter which performs input/output operation based on the request from the process; and a scheduler which keeps the process in wait state while the adapter is performing input/output operation. When the input/output operation of the adapter is completed, the state of the process waiting for the completion of the operation is changed into 'runnable' by the adapter, and the execution of the process which requested input/output operation is thereby restarted.

Data processing device and its input/output method and program

A computer controls I/O allocation for partitions independently of CPU allocation and, in each I/O adapter and partition, the computer has a scheduling means controlling allocation for partitions of the I/O adapter by time sharing, a means to allocate the I/O adapter to partitions by space sharing and a means to dynamically change said allocation made by a partition-control program. Further, the computer has a means to monitor input/output performance of each partition, and a means to maintain SLA of a user program according to performance of each partition.

Computer forming logical partitions

A storage comprising an object access module for the shared part for implementing advanced I/O provides an interface () for registering and deleting object description data declaring how to store objects within a second storage, in order to reduce the development cost of modules for implementing functions. Also, in order to reduce the total cost of ownership, modules are transferred to the storage through a management computer. The present invention allows the storage for contiguously providing functions effective to a vast range of applications to be provided with lower development cost as well as lower total cost of ownership.

Method and apparatus for implementing extensible network-attached secondary storage

The present invention aims to dynamically re-configure hosts and storage in a shared-nothing database. In the shared-nothing database, processestoexecuted in the hoststoaccess data of a storage device. A system managerand a database managermanage the hoststoand the storage device. The processestoaccess one or more diskstoof the storage device. To add or reduce the number of the hosts, the processestoare reassigned among the hoststo

Database control method

A storage apparatus and a storage method for decreasing the number of storage devices shared by a plurality of servers for reduced size and power consumption and for updating storage contents by preventing services from being degraded. A first virtual volume includes a plurality of storage devices and saves the same data in part or all of the storage devices. A virtualization engine detaches a storage device from the first virtual volume and generates a second virtual volume from the detached storage device. The virtualization engine further detaches a storage device from the first virtual volume and moves the detached storage device to the second virtual volume. The virtualization engine writes the difference between data saved in the first and second virtual volumes to the moved storage device.

Shared storage device and method for updating contents of the same

When a load of a user is fluctuated, a data center dynamically changes resource allocation to the user according to the load and holds security for each user. A control program on a data center managing server creates a VLAN configuration table so as to allocate a user-dedicated VLAN including plural network switches for each user company, thereby configuring the ports of a load balancer and network switches allocated to a user to the user-dedicated VLAN. A VPN is configured from the user to the data center, whereby a VLAN tagging technique is used to hold security of the user from the user to the data center. The control program compares a user condition setting table created along the service level agreement for each user with the monitoring result of the computer operating state (the CPU utilization history in a VLAN operation table) to dynamically change the computer allocation and VLAN configuration at unsatisfied agreement. Specifically, the VLAN configuration table and the VLAN operation table are changed to change the VLAN configuration in the load balancer and the network switches (in the case of the Web layer). The control program changes the parameter (the sever allocation history in the VLAN operation table) related to charge information based on that.

Computer resource allocating method

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

In a communicating method between data processing apparatuses using the Sockets API or the MPI API, the apparatus on the receiving side informs the apparatus on the sending side of a data length threshold, which makes the apparatus on the sending side to decide between sending data to a pre-registered pre-allocated buffer on the apparatus on the receiving side, or having the memory region that is the final destination of the data transfer registered and then sending the data to this memory region. When the length of the data to be sent does not exceed the threshold, sending to the pre-allocated buffer is selected, and the data transfer operation is completed by copying the received data from the pre-allocated buffer to the final destination of this transfer. In case the length of the data to be sent exceeds the threshold, the data is sent directly to the final destination of this transfer.

Method of transferring data between memories of computers

A data request analysis unit for accepting and analyzing a request from a client computer, a data conversion program generation unit, and a data conversion unit are provided in a magnetic disk apparatus, the data conversion program generation unit downloads a program module by way of a network as required based on the analysis result obtained by use of the data request analysis unit to generate a data conversion program, and the data conversion unit downloads the conversion program, and converts the type of the data read out from the magnetic memory medium by use of the program, and directly transfers the converted data to the client computer by way of a network interface, thereby, the present invention provides a general purpose magnetic disk apparatus which is capable of flexibly accommodating the request from the client computer, the scalability of the whole system is improved because the data is converted in the magnetic disk apparatus, and the process efficiency of the client computer is improved.

Active memory and memory control method, and heterogeneous data integration use system using the memory and method

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.

This invention provides dynamic balance of the traffic among data processing devices interconnecting networks and thereby improve the networking performance. For network traffic flowing between a first network and a second network, the traffic is distributed among the data processing devices that act as routers according to the traffic amount. An algorithm for balancing the traffic is used to select appropriate data processing devices as routers.

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Kokubunji, Japan

Frederico Buchholz Maciel