Hitachi, Ltd.

Hitachi Software Engineering Company, Ltd.

Osamu Kohama

Hiroshi Morishima

Takahiro Hayashi

Makoto Aoki

Satoshi Kadoiri

Hirofumi Sahara

Isao Nagase

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

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

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Yokohama, Japan

Osamu Kohama