Fujitsu Corporation

Katsuo Enohara

Takashi Murayama

Takaaki Yamato

Nobuyuki Hirashima

Fumio Matsuo

Tetsuya Kinoshita

Takuya Kurihara

Ryota Tsukahara

Toshiaki Takeuchi

Hidetoshi Nishi

Yuki Furukawa

Tomonori Mase

Akira Ban

Naoki Hirabayashi

Osamu Shimura

A control device includes a processor. The processor is configured to receive an execution request for write processing of writing data of logical volumes to second physical volumes. The data of the logical volumes is stored in first physical volumes. The processor is configured to generate write information on basis of data sizes of the respective logical volumes and free spaces of storage areas of the respective second physical volumes. The processor is configured to perform, on basis of the write information, control of writing first data of the logical volumes from a cache unit to the second physical volumes. The processor is configured to perform control of reading second data of the logical volumes from the first physical volumes to the cache unit. The processor is configured to optimize the write information in response to completion of the control of reading.

Control device and control method

A storage device includes: a plurality of first storage devices; a second storage device; and a control device to use the plurality of first storage devices as a primary storage and the second storage device as a secondary storage, control access processing to a plurality of logical volumes each of which indicates a virtual recording medium, register a logical volume for which a mount request is made within a predetermined period of time among the plurality of logical volumes in an management information as the logical volume which belongs to the same group, and allocate a storage area of the primary storage corresponding to each of a plurality of registered logical volumes which belong to a group registered in the management information to any one of the plurality of first storage devices such that an allocation destination of the storage area is distributed among the plurality of first storage devices.

Storage device and storage control method

A storage control apparatus includes a processor. The processor is configured to store, during a normal operation mode, first data as a first logical volume in a storage section of a first virtual storage device. The first data is transmitted and received between a first host device and a physical storage device. The physical storage device stores data in a physical volume. The first virtual storage device is connected to the physical storage device during the normal operation mode. The processor is configured to serve, during a data migration mode, as a pseudo host device connected to a second virtual storage device. The pseudo host device accesses the second virtual storage device to read out second data of a second logical volume stored in the second virtual storage device. The first virtual storage device is connected to the second virtual storage device during the data migration mode.

Storage control apparatus and storage control method

A tape apparatus includes a tape drive and a processor. The tape drive is configured to perform data reading and data writing on a magnetic tape in which a plurality of tracks are formed. The processor is configured to control the tape drive to perform data reading and data writing on the plurality of tracks in a first segment among a plurality of segments obtained by dividing the magnetic tape in a running direction. The processor is configured to reserve a first track of the plurality of tracks as a copy target upon determining that an abnormality occurs in the first segment on the first track. The processor is configured to instruct the tape drive to copy data recorded in the first segment on the first track to a second segment on the first track at a predetermined timing. The second segment is adjacent to the first segment.

Tape apparatus and control device

A storage device includes a first storage and a processor. The processor is configured to emulate an access to a physical tape with an access to a second storage. The processor is configured to store, in the first storage, first position information in which a first position in a first physical tape is associated with a storage position in the second storage. The processor is configured to receive an instruction to move data stored at the first position in the first physical tape to a second physical tape. The processor is configured to store, in the first storage, second position information in which a second position in the second physical tape is associated with the storage position.

Storage device and control method

A tape device includes a tape drive, a storage unit, and a processor. The tape drive is configured to write plural data units in a magnetic tape formed with plural tracks. The storage unit is configured to store information indicating a reversal position set in a middle of the magnetic tape. The processor is configured to instruct the tape drive to start writing of a first data unit in the magnetic tape. The processor is configured to control the tape drive to continue the writing up to an end of the first data unit when a first write area crosses over the reversal position. The first data unit is written in the first write area. The processor is configured to control the tape drive to change a write destination from the first track to a second track after the first data unit is written and to reverse the write direction.

Tape device and controller thereof

A virtual tape device includes a determination unit and a copy creation unit. The determination unit determines, when deleting some logical volume data among a plurality of logical volume data stored on a first physical tape, whether to conduct copy processing to store a copy of the logical volume data onto a second physical tape on the basis of a storage location of the logical volume data. The copy creation unit stores, when it is determined to conduct the copy processing, a copy of the logical volume data on the second physical tape so as to cause spacing between a storage location of the logical volume data on the second physical tape and a head location on the second physical tape to become shorter than spacing between a storage location of the logical volume data on the first physical tape and a head location on the first physical tape.

Virtual tape device and virtual tape device control method

A storage control device that controls a physical storage device in a storage system, the storage control device includes: a receiving section configured to receive a command from the storage system including the physical storage device and a virtual storage device, the physical storage device configured to store data in a physical volume, the virtual storage device configured to intervene between a host device and the physical storage device and store data to be transmitted and received between the host device and the physical storage device as a virtual portable volume; a determining section configured to determine a type of the command; and a control section, if the command is an ejection command indicating an outside management of a first physical volume specified by the ejection command, configured to perform data protection setting on the first physical volume.

Storage control device for controlling physical storage device in storage system including virtual storage device, storage system including physical storage device and virtual storage device, and computer-readable recording medium storing control program for physical storage device in storage system including virtual storage device

A virtual tape device includes a storage unit, a cache determining unit, a selector, and a cache controller. The storage unit records logical volume information associated with an identifier of a logical volume, an updated time of the logical volume, information indicating whether the logical volume is allocated to a cache, an identifier of a physical volume storing data of the logical volume, and information indicating whether the physical volume are mounted in a physical tape drive. The cache determining unit determines, based on the logical volume information, whether the logical volume exists on the cache, when a request to store the logical volume on the cache is received and the cache does not have an available capacity. The selector selects the logical volume based on the determined result as an off-cache target logical volume. The selected logical volume is off-cached by the cache controller.

Virtual tape device and control method of virtual tape device

A virtual tape device includes a memory to record logical volume information that includes an identifier of a logical volume, an identifier of a physical volume that stores data of the logical volume, and information that indicates whether the data of the logical volume is cached in a cache unit, in association with each other. A determining unit that, when a copy command to copy data of the logical volume stored in a first physical volume to a second physical volume is received, determines whether a logical volume cached in the cache unit exists among the logical volumes, and a storage control unit that, when it is determined that the logical volume cached in the cache unit exists among the logical volumes, stores the data of the logical volume cached in the cache unit to the second physical volume without reference to an order indicated in the copy command.

A virtual tape device includes a storage unit, an instruction unit, and a reading unit. The storage unit stores a plurality of logical volumes. The instruction unit receives a request for mounting a specified logical volume from an information processing apparatus. The instruction unit issues a mount instruction to both a physical tape device communicated to the virtual tape device and a virtual device communicated to the virtual tape device when the specified logical volume is not stored in the storage unit. The mount instruction instructs to mount the specified logical volume. The reading unit reads data of the specified logical volume to the storage unit from a device which outputs a mount completion notification first among both of the devices which have received the mount instruction.

Virtual tape device and tape mount control method

A virtual tape device includes a first drive group of virtual tape drives, a first determination unit, and a first instruction unit. The first drive group is assigned to a first information processing apparatus. The first determination unit determines, upon receiving a first cleaning instruction for cleaning a first virtual tape drive included in the first drive group from the first information processing apparatus, whether the first cleaning instruction is to be output to a physical tape device connected to the virtual tape device. The first instruction unit instructs, when the first determination unit determines that the first cleaning instruction is to be output to the physical tape device, a first physical tape drive corresponding to the first virtual tape drive to perform cleaning. The first physical tape drive is included in the physical tape device.

Virtual tape device and cleaning control method

The present invention is made such that data in a buffer can be transferred even when read back commands are continuously issued so as to completely eliminate the need for a mechanical operation required for each data block in ROR processing, resulting in considerably reducing a processing time. For this purpose, a method of controlling a magnetic tape unit of the present invention includes the steps of, when the read back command is received from a host processor, reading plurality of data blocks, when a read position of an MTU meets a predetermined condition, reading in a forward direction a plurality of data blocks in the range between the position and a start position of the read back command so as to write the data blocks into the data buffer, storing read commands concerning the data blocks into a command queue in reverse order to how the data blocks are read, and thereafter, in response to a read command from the host processor, reading the data blocks in the data buffer in the order in which the read commands are arranged in the command queue so as to transfer the data blocks to the host processor after data expansion. Further, the invention is applied to a magnetic tape unit to write data compressed through, for example, an EDRC system onto a magnetic tape, and read the compressed data therefrom.

Growing community of inventors

Kawaguchi, Japan

Katsuo Enohara