Fujitsu Corporation

Atsushi Shinohara

Toshiaki Takeuchi

Yusuke Kurasawa

Jun Takeuchi

Tetsuya Kinoshita

Masakazu Sakamoto

Takuya Kurihara

Toshitaka Yanagisawa

Kenichi Fujita

Takashi Murayama

Takaaki Yamato

Akira Satou

Koutarou Sasage

Hiroshi Shiomi

Atsushi Masaki

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

The fiber channel switch is capable of protecting data even if communication for adjusting reserves of access rights, which is performed by communication means, is interrupted. The fiber channel switch comprises: a plurality of connection terminals connected to a host computer and a physical storage unit via fiber channels; a storage virtualization unit producing a virtual storage unit; a first communication unit for communicating with another fiber channel switch; an access adjusting unit for adjusting an access reserve between the fiber channel switches; a unit for setting a master-slave relation between the fiber channel switches; a block control unit for blocking access between the host computer and the physical storage unit via the fiber channel switch if the fiber channel switch is set as a slave when the communication between the fiber channel switches is interrupted.

Fiber channel switch and computer system using the same

A virtualization switch includes first communication line connection terminals which can be connected to a host computer, a physical storage apparatus or a plurality of physical storage apparatuses, and another virtualization switch, a second communication line connection terminal which can be connected to a single line concentrator or a plurality of line concentrators connected to a manager computer by a second communication line a storage virtualization unit, a first communication unit which can communicate with an other virtualization switch through a first communication line, second communication unit which can communicate with the other virtualization switch through an second communication line, second communication line monitor unit which test communication between the virtualization switch, and abnormal state coping unit which executes a closing process and causes the first communication unit to output a failover designation instruction.

Virtualization switch and method for controlling a virtualization switch

The storage virtualization switch is capable of correctly designating a virtual target when a host computer accesses the virtual target. A dummy virtual target, which corresponds to a virtual target, is put into an effective state after the virtual target is put into the ineffective state when the virtual target is put into the ineffective state, and the virtual target is put into an effective state after the dummy virtual target, which corresponds to the virtual target, is put into the ineffective state when the virtual target is put into the effective state.

Storage virtualization switch

The computer system is capable of setting centralized modules so as to make most of access requests to a virtual storage unit correspond to physical storage units assigned to a centralized module, which receives the requests. The computer system comprises a storage virtualizer having: a unit for selecting a centralized module, which is assigned to deal with the storage areas of the physical storage units having the maximum storage capacity for the storage area of the corresponding virtual storage unit; and a unit for assigning the centralized module selected by the selecting unit as the object centralized module, to which the virtualization unit sends the access request.

Growing community of inventors

Kawasaki, Japan

Atsushi Shinohara