Hitachi, Ltd.

Takashi Kaga

Yoshihiro Asaka

Hiroshi Arakawa

Takao Sato

Yusuke Hirakawa

Ryusuke Ito

Takahiko Takeda

Kouji Arai

Yutaka Watanabe

Haruaki Watanabe

Masanobu Yamamoto

Tomohiro Nishimoto

In a storage device according to the present invention, controllers each having a cache memory manage duplication of cache data. A storage device SD includes multiple controllerseach including a cache memory, and multiple storing unitsused by the controllers and configured with logical volumefor being provided to a higher-level device. Each of the controllers, in a case where a paired destination controller forming a duplication pair is blocked, selects a new paired destination controller for each logical volume, forwards the cache data stored in the cache memory included in the own controller to the new paired destination controller, and stores the cache data in a cache memory included in the new paired destination controller to duplicate the cache data.

Storage device, controlling method of storage device, and storage device controller having predetermined management information including face attribute information, a controller number, and transition method information

A remote copy system includes: a first storage system having a first logical volume accompanied with a first plurality of disk drives in the first storage system; a second storage system having a second logical volume, which is a virtual volume not accompanied with a second plurality of disk drives in the second storage system, the virtual volume configuring a first remote copy pair with the first logical volume; and a third storage system having a third logical volume accompanied with a third plurality of disk drives in the third storage system, the third logical volume configuring a second remote copy pair with the virtual volume and storing a copied data of data stored in the first logical volume. If the second storage system receives write data sent from the first storage system to the virtual volume, the second storage system transfers the write data to the third logical volume.

Remote copy method and remote copy system

A remote copy system includes: a first storage system having a first logical volume accompanied with a first plurality of disk drives in the first storage system; a second storage system having a second logical volume, which is a virtual volume not accompanied with a second plurality of disk drives in the second storage system, the virtual volume configuring a first remote copy pair with the first logical volume; and a third storage system having a third logical volume accompanied with a third plurality of disk drives in the third storage system, the third logical volume configuring a second remote copy pair with the virtual volume and storing a copied data of data stored in the first logical volume. If the second storage system receives write data sent from the first storage system to the virtual volume, the second storage system transfers the write data to the third logical volume in the third storage system.

A storage apparatus provides, in a dynamic provisioning system, a virtual logical device (DP-LDEV) that is a virtual logical device configured of a real logical device (N-LDEV). In the storage apparatus, a storage area of a real logical device is managed by being divided into unit cache areas (SLCBs), which are predetermined management units. A storage area of a virtual logical device is managed by being divided into virtual unit areas (PSCBs), which are predetermined management units. Multiple virtual unit areas having the same data stored therein are made to correspond to the same unit cache area, and thereby data stored in a storage device is managed. The correspondence is established with at the timing of, for example, destaging data from a cache memory.

Storage apparatus and method for eliminating redundant data storage using storage apparatus

Method and apparatus for using the storage resources of a storage system effectively, thereby reducing the cost of the storage system and improving its usability. The storage system includes a first storage apparatus and a second storage apparatus. When a host writes data to a virtual volume, the data are written into a pool area. A management table associates an address in the virtual volume with a pointer indicating the data stored in the pool area. The usage amount of the pool area is monitored. When the usage amount of the pool area reaches a predetermined value, a search for available capacity is performed. An unused external volume is detected and associated with an externally connected volume. The data stored in the pool area are then copied to the externally connected volume.

Storage system and storage system control method in which storage areas can be added as needed

A data copy method for a disk sub system that is equipped with a first storage apparatus including a first logic storage apparatus divided into a first region and a second region and a second storage apparatus including a second logic storage apparatus divided into a first region and a second region, the first logic storage apparatus and the second logic storage apparatus connecting to a host apparatus, wherein data on the first logic storage apparatus is copied to the second logic storage apparatus by an instruction from the host apparatus. With the data copy method, the second logic storage apparatus is designated as a copy destination for copying data of the first logic storage apparatus, the second region of the first logic storage apparatus and the second region of the second logic storage apparatus are switched with one another, and data stored in the first region and the second region within the first storage apparatus are copied to the first region and the second region within the second storage apparatus.

Growing community of inventors

Odawara, Japan

Takashi Kaga