Hitachi, Ltd.

Hitachi Vantara Corporation

Kazuki Matsugami

Akira Yamamoto

Tomohiro Kawaguchi

Akira Deguchi

Ryosuke Tatsumi

Yoshihiro Yoshii

Nobumitsu Takaoka

Tomohiro Yoshihara

Takashi Nagao

Kenta Shinozuka

Shinichi Hayashi

Norio Shimozono

Yasuo Watanabe

Takaki Matsushita

Shugo Ogawa

Kenichi Betsuno

This invention prevents valid data written from a healthy host from being lost when restoring data corrupted by a host infected by malware from a backup. In the disclosed storage system, a storage controller records history of data updates to data in volumes made by hosts (host computers) as update history information (an update history management table) with information that can identify the hosts respectively. When having been requested to restore data in a particular volume of the volumes with specifications of a host for which to invalidate data updates and a date and time to do so, based on the update history information, the storage controller invalidates data updates made by the specified host after the specified date and time, whereas keeping data updates valid made by a host different from the specified host after the specified date and time, and restores the particular volume.

Storage system and data restoration method

A first node performs copy (virtual copy) of address mapping between a virtual volume and a pool to a first virtual volume to create a third virtual volume in the first node. A second node performs mapping from a first pool volume in the second node to the third virtual volume in the first node, links an address of the first pool volume, which is mapped to the third virtual volume, to an address of a second virtual volume in the second node on a one-to-one basis, and performs log-structured write of the data in the second virtual volume to a second pool volume in the second node.

Storage system and memory control method

A backup-source storage system extracts, as a pattern, forwarding target data to a backup-destination storage system among data written to a storage apparatus through a volume. The backup-source storage system determines whether the extracted pattern matches with a registered pattern in the backup-source storage system. When a result of the determination is false, the backup-source storage system registers the extracted pattern and forwards the forwarding target data to the backup-destination storage system. When the result of the determination is true, the backup-source storage system does not forward the forwarding target data.

Backup system and method

A data store volume (DSVOL) for a snapshot group which is a group of the PVOL and one or more SVOLs for the PVOL is a data storage region where data of which a storage destination is one volume (VOL) of the snapshot group and meta-information of the data are stored, and the meta-information is information including address mapping between a reference source address which is an address of a position of the data in the snapshot group and a reference destination address which is an address of a position of the data in the DSVOL. A process of a storage system increases the number of DSVOLs in the snapshot group when an input/output (I/O) load on the snapshot group exceeds a threshold.

Storage system and storage control method

A storage device manages data stored in a storage drive in a plurality of logical hierarchies. The plurality of logical hierarchies include a writing hierarchy above a hierarchy of a parity group including a plurality of storage drives. The storage device writes received host data in a free area in the writing hierarchy. In the data recovery process for replacing a failure storage drive with a new storage drive, the storage device executes the garbage collection process on a first logical area in the writing hierarchy associated with the first parity group including the failure storage drive. In the garbage collection process, valid data is selected from the first logical area and copied to a second logical area associated with a second parity group different from the first parity group.

Storage device and data recovery method by storage device

A storage system includes: a storage drive having a storage medium storing a data; and a plurality of storage control units having a processor, a memory, and a port to process the data input and output to and from the storage drive, in which information related to a list of the storage control units mounted on the storage system and a maximum number of the storage control units that can be mounted on the storage system is allowed to be stored, and in which, when the storage control unit is replaced, it is determined whether the configuration to be migrated from the storage control unit to be reduced to the storage control unit to be added is migrated directly or via another storage control unit based on the number of the mounted storage control units and the maximum number of the storage control units that can be mounted.

Storage system and control method of migrating storage control unit based on maximum amount of mountable storage control units

In a multi controller storage system, hardware and software are updated without interruption. The storage system including a node has storage control units each including a processor, a memory, and a port; and a storage drive, and the storage control units each request data access and transmit and receive data with respect to a host computer via the ports. The processors process input and output data from the host computer, the memories store the control information in order to access the data stored in the storage drive, and the storage system transmits the control information stored in the memories to another node, stores the control information in the memories of the storage control units, and sets ports of the other node in consideration of a relationship between the storage control units and the ports of the nodes, if the other node can access data relating to the control information.

Storage system and method of controlling storage system that set ports associated with a logical unit

A storage system includes a storage drive that stores data and a plurality of storage apparatuses, each generating access data and writing data into the storage drive, and accessing data in the storage drive using the access data, and in a case of migrating the volume together with the access data between the storage apparatuses, one responsible for the write processing on the volume being migrated to a migration destination storage apparatus at a time of migration of the access data, and one responsible for the read processing on the volume being performed by a migration source storage apparatus using the access data, and the one responsible for the read processing being migrated to the migration destination storage apparatus after the access data is available for the migration destination storage apparatus.

Storage system and processing migration method

In a case of exchanging a migration source storage controller and a migration destination storage controller sharing one storage medium during replacement of storage devices, when hardware configurations or data management forms of the storage controllers are different, data in the storage medium cannot be shared even when data management information can be copied. Accordingly, a storage system, having a storage control unit and a storage drive provided with a storage medium, includes data management information for accessing data in the storage drive. A first storage control unit copies data management information about the data in the storage drive to a second storage control unit. When a write request is received from a host after copying of the data management information begins, each of the first storage and second storage control units stores write data related to the write request in a separate storage area of the storage drive.

Storage system and control method thereof

Storage controller replacement and firmware upgrade without service interruption

Each controller moves authority for access processing to data in a logical area allocated to the controller between the controllers, for a first storage area in which there is data related to the logical areas of the plurality of controllers by moving the authority for the access processing from a first controller to a second controller. Each of the first controller and the second controller writes data after update related to a write request to the storage area allocated to the own controller and deletes data before update in the first storage area, and moves data for which the own controller has the authority for the access processing in the first storage area to another storage area allocated to the own controller while taking over the allocation of the first storage area in relocation processing of relocating data.

Storage system and data management method of switching access authority

Multi controller storage system and method of controlling multi controller storage system

With omission of a duplication process of compressed data, a cache access frequency is reduced to improve throughput. A storage system includes first and second control units and a storage drive. Upon receiving a data write command, the first control unit stores data to be subjected to the write command in a first cache area of the first control unit, and stores the data in a second cache area of the second control unit to perform duplication, and upon completion of the duplication, the first control unit transmits a response indicating an end of write, performs a predetermined process on the data to be subjected to the write command, stores the data in a buffer area, reads the data stored in the buffer area, and transmits the read data to the storage drive.

Growing community of inventors

Tokyo, Japan

Kazuki Matsugami