Fujitsu Corporation

Masakazu Sakamoto

Toshiaki Takeuchi

Atsushi Shinohara

Tetsuya Kinoshita

Yusuke Kurasawa

Takuya Kurihara

Jun Takeuchi

Akira Hayakawa

Ryutaro Kurusu

Hidehiko Tanaka

Kenichi Fujita

Akira Satou

Koutarou Sasage

Atsushi Masaki

Hiroshi Shiomi

A switch connectable between hosts and storage device, the switch for providing a service of allotting virtual areas to be deployed in the storage device to any of the hosts upon demand, the switch includes: a processor for controlling allotment of virtual areas to the hosts and allocation of physical areas of the storage device to the virtual areas; and a memory for storing information of the host allowed access to the virtual areas, the processor controlling access by any of the hosts to the virtual area so as to restrict access by any of the hosts to a part of the virtual areas allotted to the any of the hosts in reference to the memory.

Switch apparatus storing information indicating access of hosts to virtual storage areas

A virtualization switch connected to a host computer and a plurality of physical storage devices includes a plurality of communication line connection terminals and storage virtualizing unit allowing the host computer to recognize a storage area generated by combining some or all of storage areas of the plurality of physical storage devices as a virtual storage device, a plurality of copy process unit copying data in the storage area, and control unit controlling a copy process operation by assigning copy sessions based on instructions from the host computer to the plurality of copy process unit. When the number of copy process units is larger than number of copy sessions, the control unit performs control to distribute part of a copy process in the one or copy process units that are currently performing the copy process to the one or more copy process units that are not performing the copy process.

Virtualization switch, computer system, and data copy method

A queue number acquiring unit acquires a command queuing number that is the upper limit of the number of process-waiting instructions that can be stored in each of storages that make up a virtual disk for each storage. A minimum queue number selecting unit selects the minimum value of the command queuing numbers of the storages that make up the virtual disk as a minimum queue number. A queue number setting unit sets the selected minimum queue number as the command queuing number of the virtual disk that includes the storage device of which the command queuing number is selected as the minimum queue number for each virtual disk.

Switching device, switch control method, and storage system

A switch device includes a memory unit for storing therein an error response for each error event to be sent in response at the time of a failure with respect to a control signal that controls a storage device connected to the switch device, an error response output unit for receiving input of the control signal and sequentially outputting each error response stored in the memory unit, an operation information computing unit for detecting an operation of a calculating device, which is connected to the switch device, corresponding to each error response output by the error response output unit and for obtaining, as operation information, a condition defining the operation of the calculating device upon receiving each error response, and an operation setting unit for setting operation condition at the time of a failure based on the operation information.

Switch device, switch control method and storage system

A apparatus for controlling a first storage and a second storage, has a controller for receiving a write command and a read command sent out from a host and for sending out the write command and the read command to the first storage and the second storage, a determining unit for sending out a request corresponding to the write command to the first storage and the second storage, for receiving a first response corresponding to the request from the first storage and a second response corresponding to the request from the second storage, and for determining one of the storages on the basis of each of response times, a first writing unit for writing data into the determined storage, and a second writing unit for writing the data written in the determined storage into the other storage after writing the data into the determined storage by the first writing unit.

Apparatus, computer-readable recording medium and storage system

A end report of the unloading operation is issue to a host computer for a period of time after the start of the ejecting operation of a medium cartridge of a recording/reproducing unit based on an unloading command until before the end of the unloading operation, thereby allowing the next moving command to be issued precedently to the end of the actual unloading operation. Simultaneously there for with that the unloading operation is instructed to the recording/reproducing unit on the basis of the unloading command, the end report of the unloading operation is executed to the host computer, thereby allowing the host computer to issue the next moving command. In a data transfer control between the host computer and a control unit of a library apparatus, when the number of error times of the data transfer errors exceeds a threshold value, the subsequent data transfer speed is switched to the executable data transfer speed at which the data transfer can be retried, and the data transfer is executed.

Control apparatus and method for conveyance control of medium in library

A end report of the unloading operation is issued to a host computer for a period of time between after the start of the ejecting operation of a medium cartridge of a recording/reproducing unit based on an unloading command until before the end of the unloading operation, thereby allowing the next moving command to be issued precedently to the end of the actual unloading operation. Simultaneously with that the unloading operation is instructed to the recording/reproducing unit on the basis of the unloading command, the end report of the unloading operation is executed to the host computer, thereby allowing the host computer to issue the next moving command. In a data transfer control between the host computer and a control unit of a library apparatus, when the number of error times of the data transfer errors exceeds a threshold value, the subsequent data transfer speed is switched to the executable data transfer speed at which the data transfer can be retried, and the data transfer is executed.

Growing community of inventors

Kawasaki, Japan

Masakazu Sakamoto