Hitachi, Ltd.

Hitachi Software Engineering Company, Ltd.

Hirofumi Sahara

Makoto Aoki

Hiroshi Morishima

Osamu Kohama

Satoshi Kadoiri

Isao Nagase

Hiroshi Yokouchi

Masuji Suzuki

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

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 an information processing system comprising a storage equipment which includes a logical unit logically assigned to physical devices and an information processing apparatus which sends data input/output requests to the storage equipment, wherein the data input/output requests are transferred through logical paths serving as communication paths to the logical unit, the information processing apparatus comprises a path selection management section which manages configurations of a plurality of blocks into which the logical unit is divided, an I/O request allocation section which allocates data input/output requests to be transmitted to the storage equipment to the logical paths, and I/O processing units which transmit the data input/output requests through the logical paths, according to the allocation determined by the I/O request allocation section, pursuant to an established protocol, wherein the path selection management section assigns at least one logical path to one block.

Information processing performing prefetch with load balancing

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Yokohama, Japan

Hirofumi Sahara