Hitachi, Ltd.

Xiaolin Wang

Nobuyuki Saika

Eiji Sambe

According to the prior art load distribution method, there was a drawback in that the time required from discovery of increase of load to the completion of countermeasures was long. In particular, upon receiving migration of data from other file devices, it was necessary to equalize not only the load accompanying normal processes but also the load accompanying the data migration processes. In a file system receiving migration of data from a plurality of file devices, a plurality of virtual NAS (VNAS) is provided within the file storage subsystem, and an associated VNAS for executing data migration from file devices and accesses from clients is respectively associated with each file storage subsystem. Then, the state of each VNAS is defined based on the state of progress of data migration in the file storage subsystem. According to the defined state, load distribution among VNAS is performed.

File storage system and load distribution method

The present invention concerns allocating files in storage apparatuses efficiently while satisfying requirements of the files. An information systemincludes a first server systemcoupled to a first storage apparatus, a second server systemcoupled to a second storage apparatus, and a third server systemcoupled to a third storage apparatus. When the first server systemreceives a data I/O not needing access to the entity of a file responds to the data I/O request using metadata of the file and when the first server systemreceives a data I/O needing access to the entity of a file acquires the entity of the file from the second storage apparatusor the third storage apparatusto process the data I/O request. The first server apparatus determines the allocation target of the entity of the files on the basis of a requirement set for the files and information relating to configurations of the storage apparatuses

Growing community of inventors

Odawara, Japan

Xiaolin Wang