Hitachi, Ltd.

Masaaki Hosouchi

Nobuhiro Maki

Kenichi Oyamada

Kazuhiko Watanabe

Yuri Hiraiwa

Katsuhisa Miyata

Naoko Ikegaya

Yuichi Yagawa

Masahide Sato

Toshiaki Arai

Takashi Nagao

Takahiro Fujita

Akihiro Mannen

Hisashi Katada

Taiki Miyaji

Yuki Nikaido

Takeyuki Imadu

A storage apparatus has a tiered pool including a plurality of storage tiers formed by a plurality of real page groups having different input/output performance and provides a virtual volume to which a storage area is allocated by a real page unit. At a time point before new data to be written to the virtual volume occurs based on a data object, if a real page is allocated to a write destination virtual page which is a write destination of the new data, a host computer transmits a change command to change the real page allocated to the write destination virtual page to a real page in a storage tier having predetermined performance to the storage apparatus. The storage apparatus changes the real page allocated to the write destination virtual page to a real page in the storage tier having the predetermined performance according to the change command.

Computer system, data management method, and host computer

A computer system and method which stores path definition information including a storage ID, a volume ID, and validities of paths between a host computer and a first or second storage system identified by the storage ID for accessing a volume identified by the volume ID in one of the storage systems, sends an I/O request via the paths, based on the path definition information, receives information indicating the storage and volume IDs, and updates the path definition information. During initial copying from the second to the first volume, validity corresponding to a first path is set to 'Invalid' and validity corresponding to a second path is set to 'Valid'. After completion of initial copying, the validity corresponding to the first path included in the path definition information is changed to &#x201c;Valid.&#x201d;

Dual writing device and its control method

This invention provides a storage system coupled to a computer that executes data processing jobs by running a program, comprising: an interface; a storage controller; and disk drives. The storage controller is configured to: control spinning of disk in the disk drives; receive job information which contains an execution order of the job and a load attribute of the job from the computer before the job is executed; select a logical volume to which none of the storage areas are allocated when requested by the computer to provide a logical volume for storing a file that is used temporarily by the job to be executed; select which storage area to allocate to the selected logical volume based on at least one of the job execution order and the job load attribute; allocate the selected storage area to the selected logical volume; and notify the computer of the selected logical volume.

Device allocation utilizing job information, storage system with a spin control function, and computer thereof

A data storing system include a first and second storage system, each including a cache memory and a disk drive, and a third storage system coupled to the first and second storage systems and including a third disk drive to provide a third logical volume based on the third disk drive. First and second write data is transmitted from the first storage system to the second storage system according to copy pair management information. A certain storage system, which is one of the first and second storage systems, destages the second write data from a cache memory of the certain storage system to the third logical volume in the third storage system according to a volume and storage conversion table in the certain storage system.

This invention relates to data backup and data recovery in a computer system. An outputting unit updates data stored in a first area based on an update request of data from the host computer, a creating unit stores update data for the update request in a second area, a marker processing unit creates a marker containing information of the range, in which the data is stored, and information indicating whether or not the data is allowed to be stored in a third area based on a request of creating the marker from the host computer to store the created marker in the second area, and a reflecting unit refers to the marker, obtains the update data corresponding to the data storing range, which is stored prior to the marker, and reflects the obtained update data to the third area.

Storage system with journal reflecting area control function

A storage system where storage devices themselves have WORM functionality that can be set at any time. The storage system includes storage devices, and a controller for controlling data transmission between the storage devices and an information processor. Each storage device has a storage cell and a fuse at a midpoint on a write control line, and the controller applies a voltage to the fuse to blow it to set WORM for the storage cell.

Storage system

There is provided a computer system which can implement ease of transition to a standby state caused by power-off of a volume and ease of recovery from a standby state while maintaining access performance. A computer system including a storage system () having one or more disk units () and a disk controller unit () which controls reading and writing of data stored on volumes formed by the disk units and a host computer () which transmits a data read/write request to the storage system (), wherein the host computer () gives an instruction to perform volume assignment for each of groups each having duplicated sets obtained by multiply duplicating a set composed of one or more volumes on which data is to be stored, and the storage system () assigns a first volume of a first duplicated set in the group to one of the disk units () which has an attribute different from an attribute of a volume constituting another duplicated set.

Computer system and storage system and volume assignment method

The data processing system comprises at least one first storage system, and at least one second storage system connected to the first storage system. The second storage system receives change information identifying pre-change and post-change copy destination storage areas in a change process for changing a copy destination storage area of a target copy pair to another storage area of the second storage system; transmits the change information to the first storage system that has a copy source storage area in the target copy pair; and transmits copy information for the purpose of copying data between the pre-change and post-change copy destination storage areas. The first storage system refers to pair information identifying the copy pair, and transmits a copy of the data stored in a copy source storage area to the second storage system that has a copy destination storage area. The first storage system updates the pair information according to the change information received from the second storage system.

Data processing system

Related plural logical volumes can be used after switching over from the host computer therein. A switching command, which a host computer sends, makes a storage device search for a switching target volume, from the volume tables, that is identical to identification information of the switching target volume received among switching target candidate volumes that form a volume pair relation with the switching source volume. The storage device memorizes an intra-host ID of the switching target volume and an intra-storage ID of the switching target volume in a switching table with a correspondence there between. The storage device acquires the intra-storage ID of the switching target volume in reference to the switching table in the case of receiving an access request, such that the intra-host ID of the switching source volume is used as a key, and executes switching to access to the switching target volume.

Computer system, storage device and method providing intra-storage volume identifiers corresponding to intra-host volume identifiers through volume switching commands

In a storage control method for use in a computer system having a main storage, a first external storage, and a second external storage having an access speed higher than that of the first external storage, a check is made for a free area of the second external storage to decide a size of the free area. The size is compared with a predetermined first reference value. If the size is smaller, to prepare a free area having a size not less than the first reference value, the storage contents are transferred from the second external storage to the first external storage. If the free area size is larger than the first reference value, the size is next compared with a predetermined second reference value greater than the first reference value. If the size is larger than the first reference value and smaller than the second reference value, a predetermined amount of the storage contents are transferred from the second external storage to the first external storage.

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Zama, Japan

Masaaki Hosouchi