Hitachi, Ltd.

Azusa Sudo

Yoshiaki Eguchi

Masayuki Yamamoto

Kenta Shiga

Yoichi Mizuno

Toshihiko Murakami

Proposes the realization of the performance stability operation of virtual volumes and the stabilized access performance for the virtual volumes in the storage apparatus. In the storage apparatus which configures a pool of multiple types of storage tiers of different performances, provides virtual volumes to the host computer and, in accordance with a write request from an application to a virtual volume, assigns pages to the relevant virtual volume from the pool, a policy associating an application with the virtual volume with which the relevant application reads/writes data, a storage tier to assign pages to the relevant virtual volume, and the priority of the relevant storage tier is managed and, in accordance with a write request from the application, complying with the corresponding policy, among the storage tiers associated with the corresponding virtual volume, pages are assigned from the storage tier of the higher priority to the relevant virtual volume.

Storage system and data management method with application specific storage tiers

A storage system comprises a virtual volume configured of multiple virtual areas and a pool configured of multiple actual area groups of different performances. The controller of the storage system manages which actual areas are assigned to which virtual areas and the access load on the actual areas assigned to the virtual areas. The controller, if the access load of a first actual area assigned to a first virtual area is inappropriate for a first actual area group comprising the first actual area, migrates data to a second actual area in a second actual area group which is appropriate for the access load of the first actual area from the first actual area. The controller performs data migration between actual areas for achieving data allocation at a certain point of time based on history information which is the information related to a virtual area at a point of time in the past and an actual area assigned to the virtual area. Data allocation is the allocation of data in a virtual area to an actual area in an actual area group.

Storage system for reallocating data in virtual volumes and methods of the same

A storage system is provided which is capable of realizing a remote copy function for speeding up lines virtually by satisfying such demand to distribute copy data into a plurality of lines. In a storage system for connecting a local storage device and a remote storage device via a plurality of lines, the local storage device includes a remote copy program for distributing data of a plurality of logical volumes accessed from a host computer into a plurality of paths on the basis of status of the plurality of paths interposing the plurality of lines, to perform a remote copy from the local storage device to the remote storage device. Accordingly, the local storage device distributes data of the logical volumes into the plurality of lines to copy the data to the remote storage device, resulting in speeding up the lines virtually.

Storage system and remote copy control method

There is provided a storage system providing a storage volume and being coupled via a network to a secondary storage system for storing a backup of data stored in the storage volume, the storage system copies data stored in the storage volume to the secondary storage system, upon receiving an instruction to create a backup; records the size of the data copied; predict the size of data to be copied in the future based on the recorded size of the copied data; records a usable bandwidth of the network at a time when the data is copied to the secondary storage system; predicts a usable bandwidth in the future based on the recorded usable bandwidth of the network; and predicts a time period required for copying data to the secondary storage system based on the predicted size of data to be copied and the predicted usable bandwidth of the network.

Growing community of inventors

Kawasaki, Japan

Azusa Sudo