International Business Machines Corporation

Nhk Spring Co., Ltd.

Other

Kohei Taguchi

Nhk Spring R & D Center Inc.

Toshiyuki Shiratori

Michihiko Ayada

Norie Iwasaki

Takeshi Nohta

Katsuyoshi Katori

Eiji Tosaka

Ichiro Takadera

Hideo Shingu

Nobuya Ezure

Kazuteru Shinozaki

Satoshi Takayasu

Tsuyoshi Miyamura

Atsushi Abe

Takeyoshi Shinbori

Tsuyoshi Kamenoue

Kenji Mikuni

Provided are a computer program product, system, and method for managing access to tape cartridges at a tape archival service provider. A determination is made as to whether a non-volatile memory of the tape cartridge stores a key encryption key comprising an encrypted user encryption key associated with a user. In response to determining that the non-volatile memory of the tape cartridge stores the key encryption key, the key encryption key is decrypted to produce the user encryption key. The user encryption key, resulting from the decrypting, is provided to an encryption engine of the tape drive to encrypt plain-text data read from the tape medium in the tape cartridge with the user encryption key to return to a read request.

Managing access to tape cartridges at a tape archival service provider

To provide a metal-based structure or nanoparticles whose homogeneity is not deteriorated and whose sticking formation is easy, and a production method thereof with a high safety. A metal-based structure comprises a hydrogen compound, cluster, or an aggregate thereof, represented by the general formula: MH. The M is a metal-based atom. The m is an integer of 3 or more and 300 or less. H is a hydrogen atom.

Metal-based structure or nanoparticles containing hydrogen, and method for producing same

A computer-implemented method, according to one embodiment, includes: sending an instruction to write a first copy of a first portion of data to a first partition on a first tape, and sending an instruction to write a second copy of the first portion of data to a second partition on a second tape. The first tape has at least the first partition and a second partition, while the second tape also has at least a first partition and the second partition. The first partition on each of the first and second tapes is closer to a beginning of the respective tape than the second partition on the respective tape. The second tape is also different than the first tape.

Reduced data access time on tape with data redundancy

A computer-implemented method, according to one embodiment, includes: selecting a first tape to write a first copy of a first portion of data to, sending an instruction to write the first copy of the first portion of data to a first partition on the first tape, wherein the first tape has at least the first partition and a second partition, selecting a second tape that is different than the first tape to write a second copy of the first portion of data to, and sending an instruction to write the second copy of the first portion of data to a second partition on the second tape, wherein the second tape has at least a first partition and the second partition. The first partition on each of the first and second tapes is closer to a beginning of the respective tape than the second partition on the respective tape.

In a storage system including plural source storage devices, a target storage device selects which source storage device to accept a copy request from the target storage device so as to minimize the load on the entire system. The system calculates first and second load values for job loads being processed. System load values for the system are derived from job load value of a specific data, and respective load values for first and second source storage devices. The system compares the system load values to select a storage device to provide the data copy so as to minimize the load on the entire system.

Selecting a virtual tape server in a storage system to provide data copy while minimizing system job load

A tape recording device, method, and computer program product are provided for performing operations of position movement, reading, and writing on a tape medium, and receiving a series of commands from an upper-layer device. The tape recording device includes a buffer for temporarily storing data related to the reading and an append write, a tape for recording the data stored in the buffer, a reading and writing head for reading data from the tape into the buffer and writing the data onto the tape, control means for reading data from a designated position of the tape and storing the data in the buffer, and for writing the data stored in the buffer onto the tape from a written data end position in response to an append write command, and a non-volatile memory for storing data stored in the buffer in response to an append write command.

Linear recording device for executing optimum writing upon receipt of series of commands including mixed read and write commands and a method for executing the same

An apparatus according to one embodiment includes a head, a controller coupled to the head, and logic integrated with and/or executable by the controller. The logic is configured to receive a series of commands, the series of commands including mixed read, overwrite, and append write commands, cause reading of data from a specified position of a tape using the head and storing the data in a buffer in response to a read command; and cause writing of data stored in the buffer starting from an appended data end position of the tape in response to an append write command.

Linear recording executing optimum writing upon receipt of series of commands including mixed read and write commands

A method is provided according to one embodiment, which executes an optimum writing method even when overwrite is intervened between mixed read and write operations. In response to receiving an overwrite command while executing the mixed operations, which writes to a predetermined tape position, when a tape position to overwrite on is encountered before the append-written data ending position of the tape (tape EOD), the overwritten tape position is regarded as the append-written data ending position of the tape (tape EOD) to update the tape EOD by the overwritten tape position. When a tape position to overwrite is encountered after the append-written data ending position of the tape (tape EOD), the overwritten tape position is updated by the append-written data ending position of a non-volatile memory (non-volatile EOD). The updating the EODs enhances the performance of the mixed read and write operations even when an overwrite command is intervening.

A tape drive is provided, which executes an optimum writing method even when overwrite is intervened between mixed read and write operations. When an overwrite command is received while executing the mixed operations, which writes to a predetermined tape position, when a tape position to overwrite on is encountered before the append-written data ending position of the tape (tape EOD), the overwritten tape position is regarded as the append-written data ending position of the tape (tape EOD) to update the tape EOD by the overwritten tape position. When a tape position to overwrite is encountered after the append-written data ending position of the tape (tape EOD), the overwritten tape position is updated by the append-written data ending position of a non-volatile memory (non-volatile EOD). The updating the EODs enhances the performance of the mixed read and write operations even when an overwrite command is intervening.

Linear recording device for executing optimum writing upon receipt of series of commands including mixed read and write commands and method and program thereof

In a controller of a tape drive, when a command processor receives a command for moving to the end of data ('EOD') or the like, an operation signal output unit suspends the moving of a tape and a cartridge memory ('CM') input/output unit stores therein a state of the tape in which the moving has been omitted. Then, when the command processor receives a command for writing data in this state, the CM input/output unit writes the data to a cartridge memory. Subsequently, for example, when a head passes a proper position at which the data should be actually written to the tape, the CM input/output unit reads the data from the cartridge memory, and the channel input/output unit writes the data to the tape at the proper position.

Apparatus for controlling writing data and method for the same

A joint of Ti--Al intermetallic compounds, comprising a plurality of base members made of a Ti--Al intermetallic compound and having Ti--Al lamellar grains, and a junction provided between the base members, made of a Ti--Al intermetallic compound and having Ti--Al lamellar grains, wherein some of the lamellar grains of the junction extend into the base members, and some of the lamellar grains of each base member may extend into the junction or pass through the junction into the other base member.

Growing community of inventors

Yokohama, Japan

Kohei Taguchi