Patents by Inventor Hitoshi Kakuta
Hitoshi Kakuta 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: 6625690Abstract: With respect to the disk drives provided power from a single power source in a disk drive system, start up power is first supplied to a first start-up group of the disks, preferably comprising all of the master disks, with the size of the group being selected so that the required current does not exceed the capacity of the power source. When the disk drives of the first group have substantially reached steady state, start-up is conducted with respect to a second start-up group of the disk drives so that the current required during start-up for the second group and the current required for steady state drive of the first start-up group does not exceed the capacity of the power source. With respect to each start-up group, the number of disk drives is the maximum integer value and decreases or remains the same with respect to subsequent start-up groups.Type: GrantFiled: April 16, 2002Date of Patent: September 23, 2003Assignee: Hitachi, Ltd.Inventors: Yoshihisa Kamo, Hitoshi Kakuta, Atsushi Tanaka, Yosuke Seo
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Publication number: 20030135808Abstract: In a disk array system of RAID (level 5) improving the system performance by distributing data, duplicated fields are allocated in a parity group in order to reduce an overhead of data write. In the data write process, write data is tentatively and duplicately written in the duplicate fields. At this time, a write completion is reported to CPU. The parity is generated later at a proper timing and written in a SCSI drive. Generating a parity and writing data can be efficiently scheduled.Type: ApplicationFiled: March 17, 2003Publication date: July 17, 2003Applicant: Hitachi, Ltd.Inventors: Hitoshi Kakuta, Yoshifumi Takamoto
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Patent number: 6557140Abstract: In a disk array system of RAID (level 5) improving the system performance by distributing data, duplicated fields are allocated in a parity group in order to reduce an overhead of data write. In the data write process, write data is tentatively and duplicately written in the duplicate fields. At this time, a write completion is reported to CPU. The parity is generated later at a proper timing and written in a SCSI drive. Generating a parity and writing data can be efficiently scheduled.Type: GrantFiled: May 23, 2001Date of Patent: April 29, 2003Assignee: Hitachi, Ltd.Inventors: Hitoshi Kakuta, Yoshifumi Takamoto
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Publication number: 20020116574Abstract: With respect to the disk drives provided power from a single power source in a disk drive system, start up power is first supplied to a first start-up group of the disks, preferably comprising all of the master disks, with the size of the group being selected so that the required current does not exceed the capacity of the power source. When the disk drives of the first group have substantially reached steady state, start-up is conducted with respect to a second start-up group of the disk drives so that the current required during start-up for the second group and the current required for steady state drive of the first start-up group does not exceed the capacitv of the power source. With respect to each start-up group, the number of disk drives is the maximum integer value and decreases or remains the same with respect to subsequent start-up groups.Type: ApplicationFiled: April 16, 2002Publication date: August 22, 2002Applicant: Hitachi, Ltd.Inventors: Yoshihisa Kamo, Hitoshi Kakuta, Atsushi Tanaka, Yosuke Seo
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Patent number: 6397294Abstract: With respect to the disk drives provided power from a single power source in a disk drive system, start up power is first supplied to a first start-up group of the disks, preferably comprising all of the master disks, with the size of the group being selected so that the required current does not exceed the capacity of the power source. When the disk drives of the first group have substantially reached steady state, start-up is conducted with respect to a second start-up group of the disk drives so that the current required during start-up for the second group and the current required for steady state drive of the first start-up group does not exceed the capacity of the power source. With respect to each start-up group, the number of disk drives is the maximum integer value and decreases or remains the same with respect to subsequent start-up groups.Type: GrantFiled: February 21, 2001Date of Patent: May 28, 2002Assignee: Hitachi, Ltd.Inventors: Yoshihisa Kamo, Hitoshi Kakuta, Atsushi Tanaka, Tosuke Seo
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Publication number: 20010025360Abstract: In a disk array system of RAID (level 5) improving the system performance by distributing data, duplicated fields are allocated in a parity group in order to reduce an overhead of data write. In the data write process, write data is tentatively and duplicately written in the duplicate fields. At this time, a write completion is reported to CPU. The parity is generated later at a proper timing and written in a SCSI drive. Generating a parity and writing data can be efficiently scheduled.Type: ApplicationFiled: May 23, 2001Publication date: September 27, 2001Applicant: Hitachi, Ltd.Inventors: Hitoshi Kakuta, Yoshifumi Takamoto
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Patent number: 6286108Abstract: With respect to the disk drives provided power from a single power source in a disk drive system, start up power is first supplied to a first start-up group of the disks, preferably comprising all of the master disks, with the size of the group being selected so that the required current does not exceed the capacity of the power source. When the disk drives of the first group have substantially reached steady state, start-up is conducted with respect to a second start-up group of the disk drives so that the current required during start-up for the second group and the current required for steady state drive of the first start-up group does not exceed the capacity of the power source. With respect to each start-up group, the number of disk drives is the maximum integer value and decreases or remains the same with respect to subsequent start-up groups.Type: GrantFiled: March 9, 2000Date of Patent: September 4, 2001Assignee: Hitachi, Ltd.Inventors: Yoshihisa Kamo, Hitoshi Kakuta, Atsushi Tanaka, Yosuke Seo
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Publication number: 20010008018Abstract: With respect to the disk drives provided power from a single power source in a disk drive system, start up power is first supplied to a first start-up group of the disks, preferably comprising all of the master disks, with the size of the group being selected so that the required current does not exceed the capacity of the power source. When the disk drives of the first group have substantially reached steady state, start-up is conducted with respect to a second start-up group of the disk drives so that the current required during start-up for the second group and the current required for steady state drive of the first start-up group does not exceed the capacity of the power source. With respect to each start-up group, the number of disk drives is the maximum integer value and decreases or remains the same with respect to subsequent start-up groups.Type: ApplicationFiled: February 21, 2001Publication date: July 12, 2001Applicant: Hitachi, Ltd.Inventors: Yoshihisa Kamo, Hitoshi Kakuta, Atsushi Tanaka
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Patent number: 6256749Abstract: In a disk array system of RAID (level 5) improving the system performance by distributing data, duplicated fields are allocated in a parity group in order to reduce an overhead of data write. In the data write process, write data is tentatively and duplicately written in the duplicate fields. At this time, a write completion is reported to the CPU. The parity is generated later at a proper timing and written in a SCSI drive. Generating a parity and writing data can be efficiently scheduled.Type: GrantFiled: November 19, 1999Date of Patent: July 3, 2001Assignee: Hitachi, Ltd.Inventors: Hitoshi Kakuta, Yoshifumi Takamoto
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Patent number: 6243824Abstract: An array disk subsystem including a command selector for separating a signal from a host into a data item and a command, a data dividing unit for subdividing the data item, an ECC generator for producing an ECC for each of the obtained subdata items, a group of data disks for respectively storing thereon the subdata items and the ECCs, a command interpreting unit for interpreting the command, an I/O counter for counting I/O commands in the command, a backup processor for requesting a backup command based on count information of the I/O counter, and a backup unit responsive to the backup command for sequentially reading the subdata items and the ECCs from the data disks to record therein the subdata items and the ECCs.Type: GrantFiled: December 9, 1994Date of Patent: June 5, 2001Assignee: Hitachi, Ltd.Inventors: Hitoshi Kakuta, Yoshihisa Kamo, Hajime Aoi
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Patent number: 6161194Abstract: A storage data reconstruction system including a plurality of storage units for storing therein divided data, the plural independent storage units forming a set; units for storing therein ECC data corresponding to the divided data; a spare storage unit for storing therein reconstructed data; an I/O-reconstruction control circuit; a timer; a data reconstructing table for a storage unit which has failed and a circuit for reconstructing faulty data. When a failure occurs in any of the storage units, the failure is detected by an error check, a state of the failure is discriminated, a preferred processing suitable for the state of the failure is selected from a processing of a normal access or read/write, and a data reconstruction processing, and the selected processing is carried out, or the frequency of the processing of the normal access or read/write and the data reconstruction processing, or the ratio of the amount of the data reconstruction processing within a unit time, is set.Type: GrantFiled: September 29, 1998Date of Patent: December 12, 2000Assignee: Hitachi, Ltd.Inventors: Atsushi Tanaka, Yoshihisa Kamo, Hitoshi Kakuta
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Patent number: 6131142Abstract: With respect to the disk drives provided power from a single power source in a disk drive system, start up power is first supplied to a first start-up group of the disks, preferably comprising all of the master disks, with the size of the group being selected so that the required current does not exceed the capacity of the power source. When the disk drives of the first group have substantially reached steady state, start-up is conducted with respect to a second start-up group of the disk drives so that the current required during start-up for the second group and the current required for steady state drive of the first start-up group does not exceed the capacity of the power source. With respect to each start-up group, the number of disk drives is the maximum integer value and decreases or remains the same with respect to subsequent start-up groups.Type: GrantFiled: July 20, 1999Date of Patent: October 10, 2000Assignee: Hitachi, Ltd.Inventors: Yoshihisa Kamo, Hitoshi Kakuta, Atsushi Tanaka, Yosuke Seo
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Patent number: 6049890Abstract: In a disk array system of RAID (level 5) improving the system performance by distributing data, duplicated fields are allocated in a parity group in order to reduce an overhead of data write. In the data write process, write data is tentatively and duplicately written in the duplicate fields. At this time, a write completion is reported to the CPU. The parity is generated later at a proper timing and written in a SCSI drive. Generating a parity and writing data can be efficiently scheduled.Type: GrantFiled: April 2, 1996Date of Patent: April 11, 2000Assignee: Hitachi, Ltd.Inventors: Hitoshi Kakuta, Yoshifumi Takamoto
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Patent number: 6012124Abstract: With respect to the disk drives provided power from a single power source in a disk drive system, start up power is first supplied to a first start-up group of the disks, preferably comprising all of the master disks, with the size of the group being selected so that the required current does not exceed the capacity of the power source. When the disk drives of the first group have substantially reached steady state, start-up is conducted with respect to a second start-up group of the disk drives so that the current required during start-up for the second group and the current required for steady state drive of the first start-up group does not exceed the capacity of the power source. With respect to each start-up group, the number of disk drives is the maximum integer value and decreases or remains the same with respect to subsequent start-up groups.Type: GrantFiled: September 19, 1997Date of Patent: January 4, 2000Assignee: Hitachi, Ltd.Inventors: Yoshihisa Kamo, Hitoshi Kakuta, Atsushi Tanaka, Yosuke Seo
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Patent number: 6000039Abstract: A storage data reconstruction system including a plurality of storage units for storing therein divided data, the plural independent storage units forming a set; units for storing therein ECC data corresponding to the divided data; a spare storage unit for storing therein reconstructed data; an I/O-reconstruction control circuit; a timer; a data reconstructing table for a storage unit which is failed; and a circuit for reconstructing faulty data. When a failure occurs in any of the storage units, the failure is detected by an error check, a state of the failure is discriminated, a preferred processing suitable for the state of the failure is selected from a processing of a normal access or read/write and a data reconstruction processing, and the selected processing is carried out, or the frequency of the processing of the normal access or read/write and the data reconstruction processing, or the ratio of the amount of the data reconstruction processing within a unit time, is set.Type: GrantFiled: July 17, 1997Date of Patent: December 7, 1999Assignee: Hitachi, Ltd.Inventors: Atsushi Tanaka, Yoshihisa Kamo, Hitoshi Kakuta
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Patent number: 5941993Abstract: A storage data reconstruction system including: a plurality of storage units for storing therein divided data, the plural independent storage units forming a set; units for storing therein ECC data corresponding to the divided data; a spare storage unit for storing therein a reconstructed data; an I/O-reconstruction control circuit; a timer; a data reconstructing table for storage unit which has failed; and a circuit for reconstructing faulty data. When a failure occurs in any of the storage units, the failure is detected by an error check, a state of the failure is discriminated, a preferred processing suitable for the state of the failure is selected from a processing of a normal access or read/write and a data reconstruction processing, and the selected processing is carried out, or the frequency of the processing of the normal access or read/write and the data reconstruction processing, or the ratio of the amount of the data reconstruction processing within a unit time, is set.Type: GrantFiled: July 17, 1997Date of Patent: August 24, 1999Assignee: Hitachi, Ltd.Inventors: Atsushi Tanaka, Yoshihisa Kamo, Hitoshi Kakuta
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Patent number: 5889938Abstract: A storage data reconstruction system including a plurality of storage units for storing therein divided data, the plural independent storage units forming a set; units for storing therein ECC data corresponding to the divided data; a spare storage unit for storing therein reconstructed data; an I/O-reconstruction control circuit; a timer; a data reconstructing table for a storage unit which has failed; and a circuit for reconstructing faulty data. When a failure occurs in any of the storage units, the failure is detected by an error check, a state of the failure is discriminated, a preferred processing suitable for the state of the failure is selected from a processing of a normal access or read/write and a data reconstruction frequency of the processing of the normal access or read/write and the data reconstruction processing, or the ratio of the amount of the data reconstruction processing within a unit time, is set. The time taken to reconstruct the faulty data does not exceed a fixed period of time.Type: GrantFiled: September 27, 1995Date of Patent: March 30, 1999Assignee: Hitachi, Ltd.Inventors: Atsushi Tanaka, Yoshihisa Kamo, Hitoshi Kakuta
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Patent number: 5754756Abstract: The capacity efficiency of a disk array, when this disk array is constructed of drives of different capacities, is managed with a table so that areas of larger capacity disk drives of the disk array that would otherwise be left unused can be used for parity group storage. In this regard, at least one parity group can be constructed of a size based on the disk drive unit of the array having the least capacity. And, at least one other parity group can be formed of the remaining area in the disk drive units having a capacity that is greater than the disk drive unit having the least capacity that is of a size based on the remaining area of the disk drive unit having the next least capacity of the disk array.Type: GrantFiled: February 29, 1996Date of Patent: May 19, 1998Assignee: Hitachi, Ltd.Inventors: Naoki Watanabe, Hitoshi Kakuta, Yoshifumi Takamoto
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Patent number: 5752256Abstract: A disk apparatus including a disk controller connected to a plurality of drives, each having a plurality of memory disks, and an access method to the disk apparatus, are described. Accordingly, a plurality of drives are grouped into a plurality of drive groups, and a data set is divided into a plurality of partial data having a data quantity that is accessible at a given time by each of the drive groups when an access request is generated from an external apparatus to the disk apparatus. Partial data are written into the different drive groups at different times, and successive partial data are written into different drive groups. The plurality of partial data may be transferred to the drive groups in parallel with the writing of partial data into the memory disks.Type: GrantFiled: May 27, 1994Date of Patent: May 12, 1998Assignee: Hitachi, Ltd.Inventors: Hiroaki Fujii, Hitoshi Kakuta, Yoshifumi Takamoto
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Patent number: 5745789Abstract: A disc controller divides write data supplied from a CPU into a plurality of data blocks and enables a common bus to be used for one disc unit and sends one of the data blocks obtained by the division. When the data block is received into a buffer 7 in the disc unit, the disc controller immediately enables the common bus to be used for another disc unit and sends the next data block and repeats the above operations, thereby dispersing and writing the write data to the disc units.Type: GrantFiled: January 19, 1993Date of Patent: April 28, 1998Assignee: Hitachi, Ltd.Inventor: Hitoshi Kakuta