Patents by Inventor Atsuya Kumagai

Atsuya Kumagai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20080256308
    Abstract: A storage system includes one or more host computers; and a storage controller that provides each of the one or more host computers with a plurality of logical volumes, each including a storage area for reading/writing data from/to, and also being either allocated or not allocated to one or more of the host computers, the storage controller including: an identification unit that identifies function information relating to a logical volume from among the plurality of logical volumes included in information relating to the plurality of logical volumes based on a command from a host computer from among the one or more host computers; and an execution unit that executes processing on the logical volume in accordance with an identification result of the identification unit.
    Type: Application
    Filed: June 12, 2008
    Publication date: October 16, 2008
    Inventor: Atsuya Kumagai
  • Publication number: 20080244306
    Abstract: In a storage system performing remote copy, when a failure occurs in a storage apparatus, optimum redundancy configuration is reestablished promptly. In the storage system performing remote copy, when a storage apparatus detects a failure in its disk drive, a storage apparatus capable of providing a logical unit that can be a replacement for the logical unit affected by the failure in the disk drive is searched for based on storage apparatus performance, and a redundancy configuration is reestablished using a new logical unit the found storage apparatus provides.
    Type: Application
    Filed: January 3, 2008
    Publication date: October 2, 2008
    Inventor: Atsuya KUMAGAI
  • Patent number: 7421511
    Abstract: In a computer system in which a computer, storage devices, and a storage management device are connected by a network, the computer or a first storage device accesses a second storage device using a plurality of paths in the network, and the computer or the first storage device performs load balancing among the plurality of paths on the basis of a ratio set in advance, it is detected that congestion has occurred on a path, a ratio at the time of congestion of the path is calculated, and a difference between the ratio at the time of congestion and the ratio set in advance is allocated to a ratio of the other paths between the computer or the first storage device and the second storage device.
    Type: Grant
    Filed: July 20, 2004
    Date of Patent: September 2, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Kenta Shiga, Atsuya Kumagai, Keisei Fujiwara
  • Patent number: 7380019
    Abstract: In a computer system in which a computer, storage devices, and a storage management device are connected by a network, the computer or a first storage device accesses a second storage device using a plurality of paths in the network, and the computer or the first storage device performs load balancing among the plurality of paths on the basis of a ratio set in advance, it is detected that congestion has occurred on a path, a ratio at the time of congestion of the path is calculated, and a difference between the ratio at the time of congestion and the ratio set in advance is allocated to a ratio of the other paths between the computer or the first storage device and the second storage device.
    Type: Grant
    Filed: March 17, 2004
    Date of Patent: May 27, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Kenta Shiga, Atsuya Kumagai, Keisei Fujiwara
  • Publication number: 20080082749
    Abstract: The present invention provides a storage system, a method for managing the same, and a storage controller, to obtain a storage apparatus that uses iSCSI protocol, which makes it possible for each user to configure the necessary settings within the scope of their provided right.
    Type: Application
    Filed: November 14, 2006
    Publication date: April 3, 2008
    Inventor: Atsuya Kumagai
  • Patent number: 7353542
    Abstract: In a computer system in which one or more computers on which one or more initiators operate and a storage device on which one or more targets operate are connected with each other through a network, an authentication table for authenticating validity of a user of a computer is associated with an authorization table for authorizing access of an initiator to a certain target, to limit such accesses.
    Type: Grant
    Filed: June 29, 2004
    Date of Patent: April 1, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Kenta Shiga, Atsuya Kumagai, Daiki Nakatsuka, Keisei Fujiwara
  • Publication number: 20070061510
    Abstract: A storage unit is provided which is connected to a host computer through a network, having one or more disks in which read and write operations are performed during rotation and a control unit for controlling the rotation of the disks. In the storage unit, when receiving a message which is sent from the host computer and predicts that at least one of the disks will come in use, the control unit causes the at least one of the disks which will come in use, to rotate.
    Type: Application
    Filed: October 19, 2005
    Publication date: March 15, 2007
    Inventors: Atsuya Kumagai, Kenta Shiga, Takashige Iwamura
  • Publication number: 20060271639
    Abstract: In a storage device having redundant input/output paths, both a transmission data amount and a reception data amount are smoothed among paths. A storage device predicts not only a transmission data amount to be formed by an output request in a transmission queue but also a reception data amount to be formed by an input request in the transmission queue. The storage device stores a newly occurred output request in a queue having a minimum predicted transmission data amount and stores a newly occurred input request in a queue having a minimum predicted reception data amount. In a storage device having redundant input/output paths, transmission data amounts and reception data amounts can be smoothed among the paths.
    Type: Application
    Filed: July 12, 2005
    Publication date: November 30, 2006
    Inventors: Atsuya Kumagai, Toshihiko Murakami
  • Publication number: 20060265515
    Abstract: In a computer system having a storage device, switches and hosts respectively connected by a network, in accordance with an ID of a logical volume of the storage device and an IP address of a host, access control configuration of the logical volume is performed relative to the storage device, the IP address of the host is converted into a MAC address, the MAC address of the host is converted into a port ID of the switch connected to the host, and addition of the port to virtual local area network (VLAN) is performed for the switch. Logical unit number (LUN) masking and VLAN configuration essential for security countermeasure of IP-SAN (Internet protocol-storage area network) can be managed collectively by a system administrator so that the running cost of IP-SAN can be lowered.
    Type: Application
    Filed: July 27, 2006
    Publication date: November 23, 2006
    Inventors: Kenta Shiga, Atsuya Kumagai, Keisei Fujiwara
  • Publication number: 20060253564
    Abstract: In a computer system having a storage device switches and hosts respectively connected by a network, in accordance with an ID of a logical volume of the storage device and an IP address of a host, access control configuration of the logical volume is performed relative to the storage device, the IP address of the host is converted into a MAC address, the MAC address of the host is converted into a port ID of the switch connected to the host, and addition of the port to virtual local area network (VLAN) is performed for the switch. Logical unit number (LUN) masking and VLAN configuration essential for security countermeasure of IP-SAN (Internet protocol-storage area network) can be managed collectively by a system administrator so that the running cost of IP-SAN can be lowered.
    Type: Application
    Filed: July 5, 2006
    Publication date: November 9, 2006
    Inventors: Kenta Shiga, Atsuya Kumagai, Keisei Fujiwara
  • Patent number: 7130900
    Abstract: In a computer system having a storage device, switches and hosts respectively connected by a network, in accordance with an ID of a logical volume of the storage device and an IP address of a host, access control configuration of the logical volume is performed relative to the storage device, the IP address of the host is converted into a MAC address, the MAC address of the host is converted into a port ID of the switch connected to the host, and addition of the port to virtual local area network (VLAN) is performed for the switch. Logical unit number (LUN) masking and VLAN configuration essential for security countermeasure of IP-SAN (Internet protocol-storage area network) can be managed collectively by a system administrator so that the running cost of IP-SAN can be lowered.
    Type: Grant
    Filed: September 22, 2003
    Date of Patent: October 31, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Kenta Shiga, Atsuya Kumagai, Keisei Fujiwara
  • Patent number: 7092982
    Abstract: Each of the storage devices 1, 2 is provided with transmission queues 306a, 306b with respect to each of transmission paths A and B. The storage device 1 stores identical request data in each of the transmission queues 306a and 306b, and transmits each data to the counterpart storage device 2, respectively via the transmission path A and B (S811, 812). The storage device 2, being a counterpart, stores the request data or response data arrived earlier in the receive history information table 300 (S817), and discards the request data arrived later (S903, 904). Furthermore, if the storage device 1, being a transmission source, receives at least one response data against the request data, the storage device 1 searches the transmission queues 306a, 306b, and if there remains request data in any of the transmission queue, deletes the request data (S909).
    Type: Grant
    Filed: July 1, 2004
    Date of Patent: August 15, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Keisei Fujiwara, Kenta Shiga, Atsuya Kumagai
  • Publication number: 20060056293
    Abstract: A port assignment device capable of properly distributing loads on each of a plurality of ports is provided. The device assigning a plurality of ports, storing data from external devices via a network in a plurality of storage modules and managing the data in the storage modules by a plurality of targets processing initiator commands from the external devices, to the targets includes a load information storage module which stores load information indicating a load on each port assigned to each of the targets and a processing module which alters the port assignment to each target so as to disperse the load on each port based on the load information stored in the load information storage module. It then becomes possible to control amounts of data to be transmitted or received, that is, to properly distribute such amounts of data.
    Type: Application
    Filed: November 12, 2004
    Publication date: March 16, 2006
    Inventors: Atsuya Kumagai, Daiki Nakatsuka, Mitsuru Ikezawa, Naoko Iwami
  • Publication number: 20050257274
    Abstract: In a computer system in which one or more computers on which one or more initiators operate and a storage device on which one or more targets operate are connected with each other through a network, an authentication table for authenticating validity of a user of a computer is associated with an authorization table for authorizing access of an initiator to a certain target, to limit such accesses.
    Type: Application
    Filed: June 29, 2004
    Publication date: November 17, 2005
    Inventors: Kenta Shiga, Atsuya Kumagai, Daiki Nakatsuka, Keisei Fujiwara
  • Publication number: 20050240681
    Abstract: Each of the storage devices 1, 2 is provided with transmission queues 306a, 306b with respect to each of transmission paths A and B. The storage device 1 stores identical request data in each of the transmission queues 306a and 306b, and transmits each data to the counterpart storage device 2, respectively via the transmission path A and B (S811, 812). The storage device 2, being a counterpart, stores the request data or response data arrived earlier in the receive history information table 300 (S817), and discards the request data arrived later (S903, 904). Furthermore, if the storage device 1, being a transmission source, receives at least one response data against the request data, the storage device 1 searches the transmission queues 306a, 306b, and if there remains request data in any of the transmission queue, deletes the request data (S909).
    Type: Application
    Filed: July 1, 2004
    Publication date: October 27, 2005
    Applicant: Hitachi, Ltd.
    Inventors: Keisei Fujiwara, Kenta Shiga, Atsuya Kumagai
  • Publication number: 20050210144
    Abstract: A load balancing method includes a measurement step of measuring reception loads of respective storage ports 301 provided in a storage system 300; an allocation changing step of changing a transmitting rate of a computer port 208 provided in a computer 200, which is allocated for each of the storage ports, on the basis of the reception loads of the respective storage ports 301 measured in the measurement step; and a transmission step of transmitting data to the respective storage ports 301 of the storage system 300 at a transmitting rate in a range not exceeding the transmitting rate for each of the storage ports 301 changed in the allocation changing step.
    Type: Application
    Filed: May 14, 2004
    Publication date: September 22, 2005
    Inventors: Atsuya Kumagai, Kenta Shiga, Naoko Iwami, Kiyoshi Honda
  • Publication number: 20050198276
    Abstract: In a computer system in which a computer, storage devices, and a storage management device are connected by a network, the computer or a first storage device accesses a second storage device using a plurality of paths in the network, and the computer or the first storage device performs load balancing among the plurality of paths on the basis of a ratio set in advance, it is detected that congestion has occurred on a path, a ratio at the time of congestion of the path is calculated, and a difference between the ratio at the time of congestion and the ratio set in advance is allocated to a ratio of the other paths between the computer or the first storage device and the second storage device.
    Type: Application
    Filed: July 20, 2004
    Publication date: September 8, 2005
    Inventors: Kenta Shiga, Atsuya Kumagai, Keisei Fujiwara
  • Publication number: 20050188109
    Abstract: In a computer system in which a computer, storage devices, and a storage management device are connected by a network, the computer or a first storage device accesses a second storage device using a plurality of paths in the network, and the computer or the first storage device performs load balancing among the plurality of paths on the basis of a ratio set in advance, it is detected that congestion has occurred on a path, a ratio at the time of congestion of the path is calculated, and a difference between the ratio at the time of congestion and the ratio set in advance is allocated to a ratio of the other paths between the computer or the first storage device and the second storage device.
    Type: Application
    Filed: March 17, 2004
    Publication date: August 25, 2005
    Inventors: Kenta Shiga, Atsuya Kumagai, Keisei Fujiwara
  • Publication number: 20050044199
    Abstract: In a computer system having a storage device, switches and hosts respectively connected by a network, in accordance with an ID of a logical volume of the storage device and an IP address of a host, access control configuration of the logical volume is performed relative to the storage device, the IP address of the host is converted into a MAC address, the MAC address of the host is converted into a port ID of the switch connected to the host, and addition of the port to virtual local area network (VLAN) is performed for the switch. Logical unit number (LUN) masking and VLAN configuration essential for security countermeasure of IP-SAN (Internet protocol-storage area network) can be managed collectively by a system administrator so that the running cost of IP-SAN can be lowered.
    Type: Application
    Filed: September 22, 2003
    Publication date: February 24, 2005
    Inventors: Kenta Shiga, Atsuya Kumagai, Keisei Fujiwara
  • Publication number: 20050010688
    Abstract: A method is provided with which a name of a virtual port is not changed when virtualized storage is moved among switches. Information about a creator and a borrower of name information is added to a table including name information and address information of a virtual port of a name server managing the name information and the address information. The name information is provided to plural switches and managed. In addition, name information, which can be used commonly among name servers managing the name information and the address information is pooled in advance, and the name information of the virtual port is borrowed from there.
    Type: Application
    Filed: August 28, 2003
    Publication date: January 13, 2005
    Applicant: Hitachi, Ltd.
    Inventors: Toshihiko Murakami, Atsuya Kumagai, Naoko Iwami