Hitachi, Ltd.

Hitachi Software Engineering Company, Ltd.

Satoshi Kadoiri

Makoto Aoki

Hiroshi Morishima

Osamu Kohama

Hirofumi Sahara

Isao Nagase

Ryota Nishino

Kazuhiro Ooyama

A first SS (storage system) provides a first SA (storage area), a second SS provides a second SA, and first and second HSs (host systems) are coupled to the first and second SSs. First and second paths connect the first HS to the first and second SAs. Third and fourth paths connect the second HS to the first and second SAs. When the first path has a higher priority than the second path after recovery where a WR (write request) is permitted to be transmitted to the first SS, if the first SA which is a write destination for the received WR is a target in a data mirroring process, the first SS transmits a notification to stop the process. The second SS performs control such that a WR specifying the second SA as a write destination fails, and then the second HS transmits the WR using the third path.

Information system, host system and access control method

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

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Chigasaki, Japan

Satoshi Kadoiri