Hitachi, Ltd.

Daisuke Kito

Kenji Fujii

Nobuyuki Osaki

Yasunori Kaneda

Manabu Kitamura

Masato Arai

Kyoko Mikami

In a computer system including a plurality of data storage apparatuses and a management computer, a given data storage apparatus, upon receipt of a control request for a local data storage apparatus from a management computer, accesses the hierarchical relation information between the storage areas in the local data storage apparatus and the storage areas of the other data storage apparatuses, and in the case where a storage area in the local data storage apparatus is set to correspond to a level lower than the other data storage apparatuses, transmits an approval request to the other data storage apparatuses. The given data storage apparatus, upon receipt of the approval from the other data storage apparatuses, executes the control request of the management computer.

Storage system

There is provided a computer system, having a host and at least one storage system. The at least one storage system provides storage area includes at least one of an encrypted storage area and a plaintext storage area The at least one storage system is configured to: receive an instruction about what type of storage area is available to the host computer; present the encrypted storage area to the host as an available storage area separate from unavailable storage areas in the case of the type of storage area being available according to the instruction indicating 'encrypted'; and present, in the case of the type of storage area being available according to the instruction indicating other than 'encrypted', one of both the encrypted storage area and the plaintext storage area to the host computer as available storage areas, and only the plaintext storage area as an available storage area.

Computer system for managing storage area state of a storage system

It is made possible to correctly decrypt data in a storage area in a computer system (storage system) having various encryption execution sections (such as a storage device or encryption appliance having an encryption function). In the case where storage areas may be encrypted by the various encryption execution sections, there is a possibility that, when a storage area is copied or the configuration of the computer system is changed, the storage area cannot be correctly decrypted unless it is managed where the storage area has been encrypted or whether the storage area is not encrypted. To prevent this, a management computer manages the key and the encryption execution section for each storage area in the system. Furthermore, when copying a storage area or the like is performed, the management computer determines which storage area's state and key should be changed together with performing the copy operation is performed, and instructs the encryption execution section to change the state and key for the storage area if it is necessary to change it.

Storage system, control method therefor, and program

A storage apparatus, which controls the input and output of data to and from a computer, includes a logical volume for storing data from the computer, a common resource for storing data pre-stored in the logical volume as update data in order to store subsequent data from the computer in the logical volume, an encryption/decryption unit for encrypting or decrypting data stored in the logical volume or update data stored in the common resource, and a key change unit for changing a key for encrypting or decrypting data stored in the logical volume. The storage apparatus changes the key for encrypting or decrypting update data stored in the common resource based on information of the key used for data stored in the logical volume.

Storage apparatus and data management method for changing keys of a logical volume and common resource

Proposed is an apparatus and method of preventing the leakage of information from an external storage apparatus even when such external storage apparatus is stolen or accessed from an unauthorized host computer. This external storage apparatus accessible from a host computer or another external storage apparatus via a network encrypts or decrypts data written from a host computer to be stored in the storage area, sends a request for existence confirmation to the host computer or the other external storage apparatus every predetermined period of time, and zeroizes an encryption key to be used in the encryption calculation for encrypting or decrypting data to be performed by the encryption calculation unit based on the result of a response from the host computer or the other external storage apparatus in reply to the request.

External storage apparatus and method of preventing information leakage

To protect data from corruption due to restoration of an encryption key to a wrong storage system, there is provided a computer system including a first storage system and a second storage system, wherein: the first storage system, upon receiving a request to write first data to a first area in the first storage system, encrypts the first data by using a first key and writes the first data in the first area, and, upon receiving a request to write second data to a third area, encrypts the second data by using a second key and transmits a request to write the encrypted second data in a second area in the second storage system; and the computer system holds the first key, an identifier of the first storage system associated with the first key, the second key, and an identifier of the second storage system associated with the second key.

Computer system, storage system and management computer for backing up and restore encryption key for storage system incorporating therein a stored data encryption function

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Machida, Japan

Daisuke Kito