Hitachi, Ltd.

Tetsuya Shirogane

Naoto Matsunami

Naoko Iwami

Kenta Shiga

Katsuya Tanaka

Atsushi Ishikawa

Koji Iwamitsu

Mitsuhide Sato

Toshiaki Minami

Kousuke Komikado

Hiroaki Yuasa

Takahide Okuno

Tetsuya Abe

Katsuyoshi Suzuki

Kenji Yamagami

Yoshihiro Asaka

Shinichi Nakayama

Akira Nishimoto

Takahiko Takeda

Norihiko Kawakami

Ikuya Yagisawa

Kentaro Shimada

Atsushi Tanaka

Shoji Kodama

Yusuke Nonaka

Kazuo Hakamata

Makio Mizuno

Koji Arai

Azuma Kano

Toshihiko Murakami

Tetsuya Uemura

Katsumi Hirezaki

Kenji Onabe

Kenichi Tsukiji

Jin Choi

Masahide Kawarasaki

Tetsuya Ohno

In order to quickly perform maintenance or exchange of a controller of a storage device having an encryption function in a storage system, a first controller in a Ready state spoofs a second controller subjected to maintenance or exchange to acquire key information from a key management server and to store the information in a memory, and a second controller reads the key information from the memory of the first controller to store the information in an own memory to convert the second controller into a Ready state. Then, the first controller deletes acquired key information from an own memory to convert the controller into a Halt state.

Method for maintenance or exchange of encryption function in storage system and storage device

The storage system according to the present invention has a function to encrypt write data from the host and store the same in a storage media. Further, validation information of write data is added to the write data during storage thereof, and the data having the validation information added thereto is encrypted and stored in the storage media. When starting the storage system or restoring the encryption key information, the encrypted data stored in the storage media is read from the disk and decrypted prior to receiving a data access request from the host, and validation of data is performed using the validation information added to the decrypted data, so as to determine whether the encryption key stored in a storage controller is valid or not.

Storage system and method for controlling storage system

Provided is a storage system including: a first interface connected to a host computer; a second interface connected to a manager terminal; a control unit connected to the first interface and the second interface and equipping a processor and a memory; and one or more disk drives in which data that is requested to read by the host computer is stored, in which the control unit detects an access from the host computer to the first interface and an access from the manager terminal to the second interface, and generates log data of operations according to the accesses. Accordingly, log data concerning every action and every operation of the storage system is maintained and stored.

Storage system for managing a log of access

A storage control apparatus stores a device attribute that indicates whether a physical storage device that is made to be a basis of a pool of a creation target is an encryption device (a physical storage device that is provided with an encryption function) or an unencryption device (a physical storage device that is not provided with an encryption function) as a pool attribute for the pool. In the case in which a pool attribute that has been stored for a pool with which a virtual volume that is a virtual logical volume of a creation target is associated indicates both of an encryption and an unencryption, the storage control apparatus associates the virtual volume of a creation target with a physical storage device that conforms to an attribute that has been specified as a volume attribute of the virtual volume of a creation target among an encryption device and an unencryption device that are a basis of a pool of the associated destination. The storage control apparatus stores a volume attribute of the virtual volume of a creation target.

Storage control apparatus to which thin provisioning is applied

A storage controller of the present invention enables a larger number of storage devices to be mounted while keeping the installation size small. A plurality of sub-storage units are disposed inside a high density-type storage unit. The respective sub-storage units comprise a plurality of hard disk drives, controller, memory, power supply device, and display part. The respective sub-storage units operate independently of one another. A controller creates a management table based on management data acquired from the respective sub-storage units. The user is notified when there is an error in the table contents. A display part lights up in accordance with an indication from a storage unit specification part, notifying the user of the location of the sub-storage unit.

Storage controller

A storage apparatus includes a drive unit in which a logical unit is formed, and a controller unit for accessing the logical unit by controlling the drive unit according to an access request sent from a host apparatus. The storage apparatus issues a logical unit takeover request to the other storage apparatuses, allocates a logical unit of another storage apparatus that will accept the transfer of the logical volume to its own logical unit according to a takeover approval sent from other storage apparatuses in response to the takeover request, and thereafter migrates data of the own logical unit to a logical unit of another storage apparatus. Subsequently, the path is switched so that the access request from the host apparatus is given to one of the other storage apparatuses.

Storage system and method of taking over logical unit in storage system

Provided is a storage subsystem capable of improving the data processing speed by balancing the load on processors and controllers. This storage subsystem includes a controller for controlling the input and output of data to and from a storage apparatus that provides to a host computer a plurality of logical units to become a storage extent for the host computer to read and write data, processes a command issued by the host computer, and has a storage resource in relation to the logical unit. The controller has a local memory for storing the command, and a processor configured from a plurality of cores for controlling the input and output of data to and from the logical unit to be subject to the input and output of the data based on the command. The local memory stores association information representing the correspondence between the plurality of logical units and the plurality of cores. Each of the plurality of cores processes the command to the logical unit to be handled by a self core based on the association information and executes I/O processing of the data to the logical unit.

Storage subsystem and remote copy system using said subsystem

Spare disk drives are provided to a chassis for storing storage devices, and, when any one of the storage devices configuring RAID fails, the storage controller copies data of the failed storage device to a spare storage device, and recognizes an additional storage device inserted into the spare disk drive as the spare storage device. Thereafter, when the foregoing storage device fails, the storage controller reproduces data of the failed storage device, copies this data to an additional storage device inserted into the spare disk drive, and recognizes the additional storage device inserted into the spare disk drive as a spare storage device. Subsequently, when the foregoing storage device fails, the storage controller reproduces data of the failed storage device and copies this data to an additional storage device inserted into the spare disk drive. RAID 6 is maintained thereby.

Storage controller and storage control method

A storage system includes a first storage node and a second storage node. The first storage node has a first logical unit to which a first target is set, and the second storage node has a second logical unit. To migrate data from the first logical unit to the second logical unit, the first storage node forwards data stored in the first logical unit to the second storage node, and the second storage node stores the data into the second logical unit. The first storage node also forwards information about the first target to the second storage node, and the second storage node sets a target to the second logical unit using the received information.

Data migration in storage system

Proposed is a storage controller and its control method for speeding up the processing time in response to a command in a simple manner while reducing the load of a controller that received a command targeting a non-associated logical volume. This storage controller includes a plurality of controllers for controlling the input and output of data to and from a corresponding logical unit based on a command retained in a local memory, and the local memory stores association information representing the correspondence of the logical units and the controllers and address information of the local memory in each of the controllers of a self-system and another-system. Upon receiving a command sent from a host computer, the controller determines whether the target logical unit is associated with the controller of a self-system or another-system based on the association information, and, when the logical unit is associated with the other-system controller, the controller transfers and stores the command to and in the corresponding other-system controller based on the address information.

Storage controller and control method thereof

The invention provides a communication control method for switching paths at high speed to switch storages without a special path switching means in a host computer, without stopping an application or without changing settings, and a device for realizing the same. The present computer system comprises a host computer, a storage devicesconnected via a networkto the host computer, and a name server, wherein the host computerhas a function to search for an alternate path when a defect is discovered in a path used for connection with the storage, and the storage devicehas a target communicating with the host computerthrough a port, a registration change means for changing a registered address associated with the registration of a migration source target registered in the name serverto an address of a migration destination port, and a means for disconnecting all communication means established with the migration source target subsequent to the registration change process.

Computer system, storage device, management server and communication control method

A storage apparatus is configured to detect a connection from a new host system having no logical unit assigned thereto. The storage apparatus assigns, if any new host system is detected, a new logical unit to that new host system. By so doing, it is possible to generate a logical unit and associate it with a relevant host system whenever a storage apparatus is introduced or a new host system is added, without input from a storage apparatus administrator at a management console. It is thus possible to simplify the storage apparatus settings required whenever a storage apparatus is introduced or a new host system is added.

Storage apparatus and control method for the same, and computer program product

Growing community of inventors

Yokohama, Japan

Tetsuya Shirogane