Patents by Inventor Katsumi Hirezaki
Katsumi Hirezaki 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).
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Patent number: 9329788Abstract: In a storage system, a real page is allocated from a pool to a write destination virtual page in a virtual volume. The real page includes multiple real regions. The storage system moves all valid data stored in two or more move-source real pages respectively allocated to two or more virtual pages, to move-destination real pages the number of which is less than the number of move-source real pages in units of real regions. Each piece of valid data can be used by any one of the access sources. The storage system writes the predetermined data to all move-source real regions in each of move-source real pages, so that each of the move-source real pages is set as a recovery target real page which is a real page storing only the predetermined data, and performs real capacity recovery for making each recovery target real page into an unallocated state.Type: GrantFiled: July 2, 2013Date of Patent: May 3, 2016Assignee: Hitachi, Ltd.Inventors: Tsuyoshi Inoue, Katsumi Hirezaki
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Publication number: 20150324139Abstract: In a storage system, a real page is allocated from a pool to a write destination virtual page in a virtual volume. The real page includes multiple real regions. The storage system moves all valid data stored in two or more move-source real pages respectively allocated to two or more virtual pages, to move-destination real pages the number of which is less than the number of move-source real pages in units of real regions. Each piece of valid data can be used by any one of the access sources. The storage system writes the predetermined data to all move-source real regions in each of move-source real pages, so that each of the move-source real pages is set as a recovery target real page which is a real page storing only the predetermined data, and performs real capacity recovery for making each recovery target real page into an unallocated state.Type: ApplicationFiled: July 2, 2013Publication date: November 12, 2015Applicant: HITACHI, LTD.Inventors: Tsuyoshi INOUE, Katsumi HIREZAKI
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Patent number: 8868934Abstract: A controller unit, a plurality of storage devices, a log area, and a normal area are provided. A quantity of log storage devices forming the log area is smaller than a quantity of normal storage devices forming the normal area. In an operational period, in which the controller unit may accept an input-output command, a power consumption condition of the log storage devices is constantly in a normal condition in which an input or output of data can be carried out, while a power consumption condition of the normal storage devices is in an energy saving condition in which a power consumption is lower than in the normal condition. The controller unit, when receiving the input-output command if the power consumption condition of the normal storage devices is the normal condition, carries out an input or output with respect to both the normal area and the log area.Type: GrantFiled: October 20, 2008Date of Patent: October 21, 2014Assignee: Hitachi, Ltd.Inventors: Katsumi Hirezaki, Akira Murotani
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Patent number: 8706961Abstract: Data is managed efficiently by switching between block level hierarchical control and file level hierarchical control according to file characteristics. A storage apparatus which is connected via a network to a host computer which requests data writing comprises storage media of a plurality of types of varying performance, a volume management unit which manages storage areas provided by the storage media of the plurality of types as different storage tiers and manages storage tiers of the same type or different types as a pool and provides predetermined areas of the pool to the host computer as volumes, and a file management unit which constructs file systems, for managing data in file units configured from a plurality of blocks, in the volumes, and receives file unit data write requests from the host computer.Type: GrantFiled: October 31, 2011Date of Patent: April 22, 2014Assignee: Hitachi, Ltd.Inventors: Katsumi Hirezaki, Nobuyuki Saika
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Patent number: 8510526Abstract: [Problem] Providing a storage apparatus and a snapshot control method for the same for preventing, even after long-term operation of snapshots as a means for backup, an increase in the amount of pre-update data retained in a differential volume. [Solution] According to this invention, snapshots utilizing pre-update data are replaced with snapshots utilizing update data so that the areas, in the differential volume, storing the pre-update data are released as free areas correspondingly, thereby avoiding accumulation of the pre-update data in the differential volume.Type: GrantFiled: January 29, 2010Date of Patent: August 13, 2013Assignee: Hitachi, Ltd.Inventors: Akira Murotani, Katsumi Hirezaki
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Publication number: 20130111171Abstract: Data is managed efficiently by switching between block level hierarchical control and file level hierarchical control according to file characteristics. A storage apparatus which is connected via a network to a host computer which requests data writing comprises storage media of a plurality of types of varying performance, a volume management unit which manages storage areas provided by the storage media of the plurality of types as different storage tiers and manages storage tiers of the same type or different types as a pool and provides predetermined areas of the pool to the host computer as volumes, and a file management unit which constructs file systems, for managing data in file units configured from a plurality of blocks, in the volumes, and receives file unit data write requests from the host computer.Type: ApplicationFiled: October 31, 2011Publication date: May 2, 2013Inventors: Katsumi Hirezaki, Nobuyuki Saika
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Publication number: 20110238937Abstract: [Problem] Providing a storage apparatus and a snapshot control method for the same for preventing, even after long-term operation of snapshots as a means for backup, an increase in the amount of pre-update data retained in a differential volume. [Solution] According to this invention, snapshots utilizing pre-update data are replaced with snapshots utilizing update data so that the areas, in the differential volume, storing the pre-update data are released as free areas correspondingly, thereby avoiding accumulation of the pre-update data in the differential volume.Type: ApplicationFiled: January 29, 2010Publication date: September 29, 2011Applicant: HITACHI, LTD.Inventors: Akira Murotani, Katsumi Hirezaki
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Patent number: 7870402Abstract: When power to a storage device is turned on and the storage device can accept a data input and output request being transmitted from an information processing device, the storage device transmits a power-on request for turning on power to the information processing device. The storage device, when it accepts a stop-power instruction, transmits a stop-power request for stopping power to the information processing device.Type: GrantFiled: July 9, 2007Date of Patent: January 11, 2011Assignee: Hitachi, Ltd.Inventors: Katsumi Hirezaki, Koji Nagata, Yosuke Murakami
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Publication number: 20100058080Abstract: To keep to a minimum a frequency of an occurrence of a necessity of changing a power consumption condition of a storage device from an energy saving condition to a normal condition. A controller unit and a plurality of storage devices being furnished, a log area and a normal area are provided based on the plurality of storage devices. A quantity of log storage devices forming a basis of the log area is smaller than a quantity of normal storage devices forming a basis of the normal area.Type: ApplicationFiled: October 20, 2008Publication date: March 4, 2010Inventors: Katsumi Hirezaki, Akira Murotani
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Patent number: 7657721Abstract: Snapshots are implemented by combining original data in a place where an operational volume has been updated with data in a place where the operational volume has not been updated. A snapshot management table maintains a value indicating that update has not been conducted, or a storage place of original data, for each of combinations of blocks in the operational volume and the snapshots. If there is a snapshot in which update has not been conducted in a update place at the time of update, then original data is copied and the snapshot management table is updated. The copied original data is managed by a difference block management table, which has a value indicating whether respective snapshots are referencing the data. If a snapshot is deleted, then the value indicating that the snapshot is referencing is altered in all entries in the difference block management table.Type: GrantFiled: May 30, 2007Date of Patent: February 2, 2010Assignee: Hitachi, Ltd.Inventors: Takahiro Nakano, Koji Sonoda, Yoshiaki Eguchi, Takashi Horiuchi, Katsumi Hirezaki
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Publication number: 20080016382Abstract: When power to a storage device is turned on and the storage device can accept a data input and output request being transmitted from an information processing device, the storage device transmits a power-on request for turning on power to the information processing device. The storage device, when it accepts a stop-power instruction, transmits a stop-power request for stopping power to the information processing device.Type: ApplicationFiled: July 9, 2007Publication date: January 17, 2008Applicant: Hitachi, Ltd.Inventors: Katsumi Hirezaki, Koji Nagata, Yosuke Murakami
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Patent number: 7302541Abstract: The present invention suppresses the generation of redundant I/O and improves the response to the host during data migration. When migrating data from the migration source volume to the migration destination volume, the access destination of the host is switched to the second storage device. When data requested by the host has not yet been migrated, data is read from the first storage device. When the frequency of access to the non-migrated area reaches a prescribed value, the target IP address is changed and discovery is implemented so as to switch the access destination of the host to the first storage device. When the frequency of access to the migrated area in the first storage device reaches a prescribed value, the access destination of the host is switched to the second storage device. The access destination of the host is controlled based on the data migration state and access state, and the generation of redundant I/O can be suppressed.Type: GrantFiled: January 21, 2005Date of Patent: November 27, 2007Assignee: Hitachi, Ltd.Inventors: Katsumi Hirezaki, Tetsuya Shirogane
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Publication number: 20070233978Abstract: Snapshots are implemented by combining original data in a place where an operational volume has been updated with data in a place where the operational volume has not been updated. A snapshot management table maintains a value indicating that update has not been conducted, or a storage place of original data, for each of combinations of blocks in the operational volume and the snapshots. If there is a snapshot in which update has not been conducted in a update place at the time of update, then original data is copied and the snapshot management table is updated. The copied original data is managed by a difference block management table, which has a value indicating whether respective snapshots are referencing the data. If a snapshot is deleted, then the value indicating that the snapshot is referencing is altered in all entries in the difference block management table.Type: ApplicationFiled: May 30, 2007Publication date: October 4, 2007Applicant: Hitachi, Ltd.Inventors: Takahiro Nakano, Koji Sonoda, Yoshiaki Eguchi, Takashi Horiuchi, Katsumi Hirezaki
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Patent number: 7246248Abstract: When power to a storage device is turned on and the storage device can accept a data input and output request being transmitted from an information processing device, the storage device transmits a power-on request for turning on power to the information processing device. The storage device, when it accepts a stop-power instruction, transmits a stop-power request for stopping power to the information processing device.Type: GrantFiled: February 9, 2006Date of Patent: July 17, 2007Assignee: Hitachi, Ltd.Inventors: Katsumi Hirezaki, Koji Nagata, Yosuke Murakami
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Patent number: 7237076Abstract: Snapshots are implemented by combining original data in a place where an operational volume has been updated with data in a place where the operational volume has not been updated. A snapshot management table maintains a value indicating that update has not been conducted, or a storage place of original data, for each of combinations of blocks in the operational volume and the snapshots. If there is a snapshot in which update has not been conducted in a update place at the time of update, then original data is copied and the snapshot management table is updated. The copied original data is managed by a difference block management table, which has a value indicating whether respective snapshots are referencing the data. If a snapshot is deleted, then the value indicating that the snapshot is referencing is altered in all entries in the difference block management table.Type: GrantFiled: August 29, 2003Date of Patent: June 26, 2007Assignee: Hitachi, Ltd.Inventors: Takahiro Nakano, Koji Sonoda, Yoshiaki Eguchi, Takashi Horiuchi, Katsumi Hirezaki
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Publication number: 20060129858Abstract: When power to a storage device is turned on and the storage device can accept a data input and output request being transmitted from an information processing device, the storage device transmits a power-on request for turning on power to the information processing device. The storage device, when it accepts a stop-power instruction, transmits a stop-power request for stopping power to the information processing device.Type: ApplicationFiled: February 9, 2006Publication date: June 15, 2006Applicant: Hitachi, Ltd.Inventors: Katsumi Hirezaki, Koji Nagata, Yosuke Murakami
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Publication number: 20060107010Abstract: The present invention suppresses the generation of redundant I/O and improves the response to the host during data migration. When migrating data from the migration source volume to the migration destination volume, the access destination of the host is switched to the second storage device. When data requested by the host has not yet been migrated, data is read from the first storage device. When the frequency of access to the non-migrated area reaches a prescribed value, the target IP address is changed and discovery is implemented so as to switch the access destination of the host to the first storage device. When the frequency of access to the migrated area in the first storage device reaches a prescribed value, the access destination of the host is switched to the second storage device. The access destination of the host is controlled based on the data migration state and access state, and the generation of redundant I/O can be suppressed.Type: ApplicationFiled: January 21, 2005Publication date: May 18, 2006Applicant: Hitachi, Ltd.Inventors: Katsumi Hirezaki, Tetsuya Sirogane
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Patent number: 7032118Abstract: When power to a storage device is turned on and the storage device can accept a data input and output request being transmitted from an information processing device, the storage device transmits a power-on request for turning on power to the information processing device. The storage device, when it accepts a stop-power instruction, transmits a stop-power request for stopping power to the information processing device.Type: GrantFiled: October 10, 2003Date of Patent: April 18, 2006Assignee: Hitachi, Ltd.Inventors: Katsumi Hirezaki, Koji Nagata, Yosuke Murakami
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Publication number: 20040225903Abstract: When power to a storage device is turned on and the storage device can accept a data input and output request being transmitted from an information processing device, the storage device transmits a power-on request for turning on power to the information processing device. The storage device, when it accepts a stop-power instruction, transmits a stop-power request for stopping power to the information processing device.Type: ApplicationFiled: October 10, 2003Publication date: November 11, 2004Applicant: Hitachi, Ltd.Inventors: Katsumi Hirezaki, Koji Nagata, Yosuke Murakami
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Publication number: 20040186900Abstract: Snapshots are implemented by combining original data in a place where an operational volume has been updated with data in a place where the operational volume has not been updated. A snapshot management table maintains a value indicating that update has not been conducted, or a storage place of original data, for each of combinations of blocks in the operational volume and the snapshots. If there is a snapshot in which update has not been conducted in a update place at the time of update, then original data is copied and the snapshot management table is updated. The copied original data is managed by a difference block management table, which has a value indicating whether respective snapshots are referencing the data. If a snapshot is deleted, then the value indicating that the snapshot is referencing is altered in all entries in the difference block management table.Type: ApplicationFiled: August 29, 2003Publication date: September 23, 2004Applicant: Hitachi, Ltd.Inventors: Takahiro Nakano, Koji Sonoda, Yoshiaki Eguchi, Takashi Horiuchi, Katsumi Hirezaki