Patents by Inventor Shrikant V. Karve
Shrikant V. Karve 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: 11073999Abstract: Migrating data in a tiered storage system. The tiered storage system includes an upper tier with at least one storage device and a lower tier with at least one storage device. Data on a storage device includes one or more extents, and each extent contains one or more grains. I/O activity of grains is recorded during a predefined time interval. For each extent, a mean heat value over grains in the extent during the predefined time interval is calculated from the recorded I/O activity, where a heat value is a numerical indication of frequency of access of a grain, and a spike heat indicator, which measures non-uniformity of heat values of grains in the extent is calculated. Two extents with mean heat values that differ at most by a predefined threshold are identified, and the extent with a greater spike heat indicator is migrated to an upper tier.Type: GrantFiled: August 28, 2019Date of Patent: July 27, 2021Assignee: International Business Machines CorporationInventors: Shrikant V. Karve, Kushal S. Patel, Sarvesh S. Patel
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Patent number: 10691371Abstract: A mechanism is provided in a data processing system for asynchronous replication. The mechanism creates a record in a write log in a host computing device for a write command and marking the record as uncommitted. The mechanism maintains a copy of data to be written by the write command at the host computing device. The mechanism issues the write command from the host computing device to a primary storage controller at the primary storage site. Responsive to receiving an acknowledgement from the primary storage controller that the data have been written to the primary storage site, the mechanism marks the record as unreplicated. Responsive to receiving an acknowledgement from the primary storage controller that the data have been replicated to a secondary storage site, the mechanism erases the record in the write log and deleting the copy of data.Type: GrantFiled: November 28, 2018Date of Patent: June 23, 2020Assignee: International Business Machines CorporationInventors: Rahul M. Fiske, Shrikant V. Karve, Sarvesh S. Patel, Subhojit Roy
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Patent number: 10540113Abstract: Migrating data in a tiered storage system. The tiered storage system includes an upper tier with at least one storage device and a lower tier with at least one storage device. Data on a storage device includes one or more extents, and each extent contains one or more grains. I/O activity of grains is recorded during a predefined time interval. For each extent, a mean heat value over grains in the extent during the predefined time interval is calculated from the recorded I/O activity, where a heat value is a numerical indication of frequency of access of a grain, and a spike heat indicator, which measures non-uniformity of heat values of grains in the extent is calculated. Two extents with mean heat values that differ at most by a predefined threshold are identified, and the extent with a greater spike heat indicator is migrated to an upper tier.Type: GrantFiled: November 28, 2018Date of Patent: January 21, 2020Assignee: International Business Machines CorporationInventors: Shrikant V. Karve, Kushal S. Patel, Sarvesh S. Patel
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Publication number: 20190384524Abstract: Migrating data in a tiered storage system. The tiered storage system includes an upper tier with at least one storage device and a lower tier with at least one storage device. Data on a storage device includes one or more extents, and each extent contains one or more grains. I/O activity of grains is recorded during a predefined time interval. For each extent, a mean heat value over grains in the extent during the predefined time interval is calculated from the recorded I/O activity, where a heat value is a numerical indication of frequency of access of a grain, and a spike heat indicator, which measures non-uniformity of heat values of grains in the extent is calculated. Two extents with mean heat values that differ at most by a predefined threshold are identified, and the extent with a greater spike heat indicator is migrated to an upper tier.Type: ApplicationFiled: August 28, 2019Publication date: December 19, 2019Inventors: Shrikant V. Karve, Kushal S. Patel, Sarvesh S. Patel
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Patent number: 10430284Abstract: A full backup copy of a storage volume can be created from only incremental backups of the storage volume. A bitmap can be created that includes a set of depopulated indicator locations configured to contain a set of indicators, where each indicator location represents a corresponding portion of the storage volume. Portions of the storage volume from which data was copied to a set of incremental backups can be identified. Indicators providing correspondence between the identified portions of the storage volume and the incremental backups of the set of incremental backups can be created in the bitmap, until the set of indicator locations in the bitmap is fully populated. In accordance with the set of indicators, data from the set of incremental backups corresponding to the identified portions of the storage volume can be copied to the backup copy.Type: GrantFiled: June 8, 2016Date of Patent: October 1, 2019Assignee: International Business Machines CorporationInventors: Abhishek Jain, Shrikant V. Karve, Kushal S. Patel, Sarvesh S. Patel
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Publication number: 20190095103Abstract: A mechanism is provided in a data processing system for asynchronous replication. The mechanism creates a record in a write log in a host computing device for a write command and marking the record as uncommitted. The mechanism maintains a copy of data to be written by the write command at the host computing device. The mechanism issues the write command from the host computing device to a primary storage controller at the primary storage site. Responsive to receiving an acknowledgement from the primary storage controller that the data have been written to the primary storage site, the mechanism marks the record as unreplicated. Responsive to receiving an acknowledgement from the primary storage controller that the data have been replicated to a secondary storage site, the mechanism erases the record in the write log and deleting the copy of data.Type: ApplicationFiled: November 28, 2018Publication date: March 28, 2019Inventors: Rahul M. Fiske, Shrikant V. Karve, Sarvesh S. Patel, Subhojit Roy
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Publication number: 20190095125Abstract: Migrating data in a tiered storage system. The tiered storage system includes an upper tier with at least one storage device and a lower tier with at least one storage device. Data on a storage device includes one or more extents, and each extent contains one or more grains. I/O activity of grains is recorded during a predefined time interval. For each extent, a mean heat value over grains in the extent during the predefined time interval is calculated from the recorded I/O activity, where a heat value is a numerical indication of frequency of access of a grain, and a spike heat indicator, which measures non-uniformity of heat values of grains in the extent is calculated. Two extents with mean heat values that differ at most by a predefined threshold are identified, and the extent with a greater spike heat indicator is migrated to an upper tier.Type: ApplicationFiled: November 28, 2018Publication date: March 28, 2019Inventors: Shrikant V. Karve, Kushal S. Patel, Sarvesh S. Patel
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Patent number: 10175909Abstract: Migrating data in a tiered storage system. The tiered storage system includes an upper tier with at least one storage device and a lower tier with at least one storage device. Data on a storage device includes one or more extents, and each extent contains one or more grains. I/O activity of grains is recorded during a predefined time interval. For each extent, a mean heat value over grains in the extent during the predefined time interval is calculated from the recorded I/O activity, where a heat value is a numerical indication of frequency of access of a grain, and a spike heat indicator, which measures non-uniformity of heat values of grains in the extent is calculated. Two extents with mean heat values that differ at most by a predefined threshold are identified, and the extent with a greater spike heat indicator is migrated to an upper tier.Type: GrantFiled: February 2, 2018Date of Patent: January 8, 2019Assignee: International Business Machines CorporationInventors: Shrikant V. Karve, Kushal S. Patel, Sarvesh S. Patel
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Patent number: 10168946Abstract: Migrating data in a tiered storage system. The tiered storage system includes an upper tier with at least one storage device and a lower tier with at least one storage device. Data on a storage device includes one or more extents, and each extent contains one or more grains. I/O activity of grains is recorded during a predefined time interval. For each extent, a mean heat value over grains in the extent during the predefined time interval is calculated from the recorded I/O activity, where a heat value is a numerical indication of frequency of access of a grain, and a spike heat indicator, which measures non-uniformity of heat values of grains in the extent is calculated. Two extents with mean heat values that differ at most by a predefined threshold are identified, and the extent with a greater spike heat indicator is migrated to an upper tier.Type: GrantFiled: July 2, 2018Date of Patent: January 1, 2019Assignee: International Business Machines CorporationInventors: Shrikant V. Karve, Kushal S. Patel, Sarvesh S. Patel
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Patent number: 10146470Abstract: A mechanism is provided in a data processing system for asynchronous replication. The mechanism creates a record in a write log in a host computing device for a write command and marking the record as uncommitted. The mechanism maintains a copy of data to be written by the write command at the host computing device. The mechanism issues the write command from the host computing device to a primary storage controller at the primary storage site. Responsive to receiving an acknowledgement from the primary storage controller that the data have been written to the primary storage site, the mechanism marks the record as unreplicated. Responsive to receiving an acknowledgement from the primary storage controller that the data have been replicated to a secondary storage site, the mechanism erases the record in the write log and deleting the copy of data.Type: GrantFiled: May 27, 2016Date of Patent: December 4, 2018Assignee: International Business Machines CorporationInventors: Rahul M. Fiske, Shrikant V. Karve, Sarvesh S. Patel, Subhojit Roy
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Publication number: 20180314459Abstract: Migrating data in a tiered storage system. The tiered storage system includes an upper tier with at least one storage device and a lower tier with at least one storage device. Data on a storage device includes one or more extents, and each extent contains one or more grains. I/O activity of grains is recorded during a predefined time interval. For each extent, a mean heat value over grains in the extent during the predefined time interval is calculated from the recorded I/O activity, where a heat value is a numerical indication of frequency of access of a grain, and a spike heat indicator, which measures non-uniformity of heat values of grains in the extent is calculated. Two extents with mean heat values that differ at most by a predefined threshold are identified, and the extent with a greater spike heat indicator is migrated to an upper tier.Type: ApplicationFiled: July 2, 2018Publication date: November 1, 2018Inventors: Shrikant V. Karve, Kushal S. Patel, Sarvesh S. Patel
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Patent number: 10042578Abstract: Migrating data in a tiered storage system. The tiered storage system includes an upper tier with at least one storage device and a lower tier with at least one storage device. Data on a storage device includes one or more extents, and each extent contains one or more grains. I/O activity of grains is recorded during a predefined time interval. For each extent, a mean heat value over grains in the extent during the predefined time interval is calculated from the recorded I/O activity, where a heat value is a numerical indication of frequency of access of a grain, and a spike heat indicator, which measures non-uniformity of heat values of grains in the extent is calculated. Two extents with mean heat values that differ at most by a predefined threshold are identified, and the extent with a greater spike heat indicator is migrated to an upper tier.Type: GrantFiled: November 8, 2016Date of Patent: August 7, 2018Assignee: International Business Machines CorporationInventors: Shrikant V. Karve, Kushal S. Patel, Sarvesh S. Patel
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Publication number: 20180136874Abstract: Migrating data in a tiered storage system. The tiered storage system includes an upper tier with at least one storage device and a lower tier with at least one storage device. Data on a storage device includes one or more extents, and each extent contains one or more grains. I/O activity of grains is recorded during a predefined time interval. For each extent, a mean heat value over grains in the extent during the predefined time interval is calculated from the recorded I/O activity, where a heat value is a numerical indication of frequency of access of a grain, and a spike heat indicator, which measures non-uniformity of heat values of grains in the extent is calculated. Two extents with mean heat values that differ at most by a predefined threshold are identified, and the extent with a greater spike heat indicator is migrated to an upper tier.Type: ApplicationFiled: February 2, 2018Publication date: May 17, 2018Inventors: Shrikant V. Karve, Kushal S. Patel, Sarvesh S. Patel
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Publication number: 20180129443Abstract: Migrating data in a tiered storage system. The tiered storage system includes an upper tier with at least one storage device and a lower tier with at least one storage device. Data on a storage device includes one or more extents, and each extent contains one or more grains. I/O activity of grains is recorded during a predefined time interval. For each extent, a mean heat value over grains in the extent during the predefined time interval is calculated from the recorded I/O activity, where a heat value is a numerical indication of frequency of access of a grain, and a spike heat indicator, which measures non-uniformity of heat values of grains in the extent is calculated. Two extents with mean heat values that differ at most by a predefined threshold are identified, and the extent with a greater spike heat indicator is migrated to an upper tier.Type: ApplicationFiled: November 8, 2016Publication date: May 10, 2018Inventors: Shrikant V. Karve, Kushal S. Patel, Sarvesh S. Patel
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Publication number: 20170357550Abstract: A full backup copy of a storage volume can be created from only incremental backups of the storage volume. A bitmap can be created that includes a set of depopulated indicator locations configured to contain a set of indicators, where each indicator location represents a corresponding portion of the storage volume. Portions of the storage volume from which data was copied to a set of incremental backups can be identified. Indicators providing correspondence between the identified portions of the storage volume and the incremental backups of the set of incremental backups can be created in the bitmap, until the set of indicator locations in the bitmap is fully populated. In accordance with the set of indicators, data from the set of incremental backups corresponding to the identified portions of the storage volume can be copied to the backup copy.Type: ApplicationFiled: June 8, 2016Publication date: December 14, 2017Inventors: Abhishek Jain, Shrikant V. Karve, Kushal S. Patel, Sarvesh S. Patel
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Patent number: 9483540Abstract: A mechanism is provided in a data processing system for data replication. The mechanism divides a set of data to be replicated into a plurality of slices. Each slice of the plurality of slices is to be copied from a primary site to a master secondary site within a plurality of secondary sites. The plurality of secondary sites comprises the master secondary site and at least one subsidiary peer site. The mechanism copies the plurality of slices from the primary site to the plurality of secondary sites such that the master secondary site stores a first slice of the set of data and each of the at least one subsidiary peer site stores a corresponding slice of the set of data. Responsive to completion of copying the plurality of slices to the plurality of secondary sites, for each of the at least one subsidiary peer site, the mechanism initiates copying of the corresponding slice of the set of data to the master secondary site.Type: GrantFiled: June 25, 2015Date of Patent: November 1, 2016Assignee: International Business Machines CorporationInventors: Shrikant V. Karve, Janmejay S. Kulkarni, Sarvesh S. Patel, Ashish R. Pathak, Sandeep R. Patil
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Publication number: 20160274795Abstract: A mechanism is provided in a data processing system for asynchronous replication. The mechanism creates a record in a write log in a host computing device for a write command and marking the record as uncommitted. The mechanism maintains a copy of data to be written by the write command at the host computing device. The mechanism issues the write command from the host computing device to a primary storage controller at the primary storage site. Responsive to receiving an acknowledgement from the primary storage controller that the data have been written to the primary storage site, the mechanism marks the record as unreplicated. Responsive to receiving an acknowledgement from the primary storage controller that the data have been replicated to a secondary storage site, the mechanism erases the record in the write log and deleting the copy of data.Type: ApplicationFiled: May 27, 2016Publication date: September 22, 2016Inventors: Rahul M. Fiske, Shrikant V. Karve, Sarvesh S. Patel, Subhojit Roy
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Patent number: 9354979Abstract: A mechanism is provided in a data processing system for asynchronous replication. The mechanism creates a record in a write log in a host computing device for a write command and marking the record as uncommitted. The mechanism maintains a copy of data to be written by the write command at the host computing device. The mechanism issues the write command from the host computing device to a primary storage controller at the primary storage site. Responsive to receiving an acknowledgement from the primary storage controller that the data have been written to the primary storage site, the mechanism marks the record as unreplicated. Responsive to receiving an acknowledgement from the primary storage controller that the data have been replicated to a secondary storage site, the mechanism erases the record in the write log and deleting the copy of data.Type: GrantFiled: February 7, 2014Date of Patent: May 31, 2016Assignee: International Business Machines CorporationInventors: Rahul M. Fiske, Shrikant V. Karve, Sarvesh S. Patel, Subhojit Roy
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Publication number: 20150302071Abstract: A mechanism is provided in a data processing system for data replication. The mechanism divides a set of data to be replicated into a plurality of slices. Each slice of the plurality of slices is to be copied from a primary site to a master secondary site within a plurality of secondary sites. The plurality of secondary sites comprises the master secondary site and at least one subsidiary peer site. The mechanism copies the plurality of slices from the primary site to the plurality of secondary sites such that the master secondary site stores a first slice of the set of data and each of the at least one subsidiary peer site stores a corresponding slice of the set of data. Responsive to completion of copying the plurality of slices to the plurality of secondary sites, for each of the at least one subsidiary peer site, the mechanism initiates copying of the corresponding slice of the set of data to the master secondary site.Type: ApplicationFiled: June 25, 2015Publication date: October 22, 2015Inventors: Shrikant V. Karve, Janmejay S. Kulkarni, Sarvesh S. Patel, Ashish R. Pathak, Sandeep R. Patil
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Publication number: 20150227431Abstract: A mechanism is provided in a data processing system for asynchronous replication. The mechanism creates a record in a write log in a host computing device for a write command and marking the record as uncommitted. The mechanism maintains a copy of data to be written by the write command at the host computing device. The mechanism issues the write command from the host computing device to a primary storage controller at the primary storage site. Responsive to receiving an acknowledgement from the primary storage controller that the data have been written to the primary storage site, the mechanism marks the record as unreplicated. Responsive to receiving an acknowledgement from the primary storage controller that the data have been replicated to a secondary storage site, the mechanism erases the record in the write log and deleting the copy of data.Type: ApplicationFiled: February 7, 2014Publication date: August 13, 2015Applicant: International Business Machines CorporationInventors: Rahul M. Fiske, Shrikant V. Karve, Sarvesh S. Patel, Subhojit Roy