Hitachi, Ltd.

Hitachi Software Engineering Company, Ltd.

Hiroshi Morishima

Osamu Kohama

Takahiro Hayashi

Makoto Aoki

Susumu Okuhara

Shingo Maeda

Hirofumi Sahara

Satoshi Kadoiri

Kikuko Morishima

Isao Nagase

Takashi Oeda

Toshio Nakano

Akinobu Shimada

Tatsuya Murakami

Yasuaki Nakamura

Shigeo Honma

Tokuhiro Tsukiyama

Hiroyuki Matsushima

Yoji Tomono

Provided is a computer system which includes computers and a storage system coupled to the computers. The storage system includes a first load measuring module that measures a first access load for each channel adaptor. At least one of the computers includes a path management module that manages paths through which the computers access logical units. The path management module includes a second load measuring module that measures a second access load imposed by access from the computer to the logical unit, and an active path setting module that selects one of the channel adaptors based on the first access and the second access load measured by the first and second load measuring modules, and setting an active path passing through the channel adaptor. Thus, a load on an entire system is balanced, thereby improving performance while a cache hit rate of a storage system is maintained.

Computer system for load balance, and method and program for setting path

A processing apparatus which stores a first information piece about attributes identifying a specific process generating data input/output requests in such a manner that the first information piece is associated with a second information piece identifying at least one of the physical paths as at least one first physical path, and which, when transmitting first data input/output requests generated by the process identified by the first information piece to the storage apparatus, transmits the first data input/output requests to the storage apparatus via the first physical path identified by the second information piece associated with the first information piece and, when transmitting second data input/output requests generated by a process not identified by the first information piece to the storage apparatus, transmits the second data input/output requests to the storage apparatus via at least one second physical path different from the first physical path of the plurality of physical paths.

Method and apparatus for managing I/O paths on a storage network using priority

Method and apparatus for managing I/O paths on a storage network

In the configuration of multiple (M units of) disk subsystems shared from multiple (N units of) hosts, having

Data storage system and control method thereof

Method and apparatus for managing i/o paths on a storage network

Provided is a high performance storage system, in which a cache memory is effectively used and access loads are balanced. In a computer system including a computer and a storage system coupled with the computer, the storage system includes one or more channel adapters which communicate with the computer, and a plurality of logical units which store data. The computer includes one or more host bus adapters which communicate with the storage system, and a path management module which manages a path along which the computer accesses the logical unit. The path management module includes a load measurement module which measures an access load on each logical unit, and an active path setting module which sets one or more active paths, along which an access from the computer passes, for each of the logical unit based on the measured access load.

Computer system for load balance, program and method for setting paths

In order to construct an integrated storage system by reinforcing collaboration of components or functions of a storage system in which a storage area network (SAN) is used, in a computer system having multiple client computers, multiple various servers, multiple various storages which keep data, and a local area network (LAN) which connects the computers and the servers, a storage area network (SAN) which lies between the servers and storages forms a switched circuit network which is capable of connecting any server and any storage through fiber channel FC switches. The computer system further includes a terminal which is equipped with operation and management software which performs storage management including management of logical volumes in the various storages, data arrangement, error monitoring, management of setting up the FC switches, and backup for data in the storages.

Computer system having a storage area network and method of handling data in the computer system

Processor apparatuses share data, used in common for a plurality of systems, in a global memory in a share system. The global memory is divided into constant units and the individual division units are managed by using identifiers which are definitely determined as viewed from the processor apparatuses and the share system. When an inter-system exclusive state conditioning unit of a processor apparatus designates a desired area on an address space in the processor apparatus by using an identifier to obtain a locked resource, an update state confirming unit checks whether data in a corresponding unit in the share system is updated, and when the data is updated, a data transferring unit transfers the data in the corresponding unit in the share system to the address space. Accordingly, a program operating on each computer system can easily access the data shared by the systems without being aware of the presence of the share system. When the locked resource is released, a data transferring unit transfers the data to the corresponding unit in the share system if the data in the address space is updated.

Data sharing method in a plurality of computer systems

A composite computer system which includes a plurality of processors connected to each other by a communication apparatus, an operation supervisory unit for recording operating conditions of the processors when the processors are activated or deactivated, an operation supervisory network for connecting the processors and the operation supervisory unit and a program condition management apparatus for recording operating conditions of programs when the programs of the processors are activated or deactivated. The operation supervisory unit obtains, for fault location purposes, the operating conditions of the processors recorded in the operation supervisory unit via the operation supervisory network and the operating conditions of the programs recorded in the program condition management apparatus.

Composite computer system

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Yokohama, Japan

Hiroshi Morishima