Patents by Inventor Roy E. Clark
Roy E. Clark 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: 10788994Abstract: A system, computer program product, and computer-executable method for managing flash devices within a data storage environment utilized by an application of one or more applications, wherein the application accesses the managed flash devices through a pool of flash storage provided by the data storage, the system, computer program product, and computer-executable method comprising receiving a data I/O from the application, analyzing the data I/O directed toward the pool of flash storage in relation to the flash devices, and managing the flash devices based on data I/Os directed toward the pool of flash storage by the application.Type: GrantFiled: December 30, 2014Date of Patent: September 29, 2020Assignee: EMC IP Holding Company LLCInventors: John S. Harwood, Robert W. Beauchamp, Roy E. Clark, Dragan Savic
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Patent number: 10509731Abstract: Methods and apparatus for providing for a cache replacement policy for page caches for storage having a first memory tier having regions and virtual memory having mmaps of ones of the regions in the first memory tier. In an embodiment, the cache replacement policy includes setting a color hint to a first one of the cached pages, wherein the color hint includes a value indicating hotness of the first one of the cached pages.Type: GrantFiled: September 30, 2014Date of Patent: December 17, 2019Assignee: EMC IP Holding Company LLCInventors: Adrian Michaud, Roy E. Clark, Kenneth J. Taylor
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Patent number: 10235291Abstract: Methods and apparatus for computer systems having first and second memory tier having regions, physical memory having page caches that are shareable with multiple ones of the regions in the first memory tier and the regions in the second memory tier, and virtual memory having mmaps of ones of the regions in the first memory tier and ones of the regions in the second memory tier, wherein the mmaps are associated with multiple ones of the pages caches.Type: GrantFiled: September 20, 2016Date of Patent: March 19, 2019Assignee: EMC CorporationInventors: Adrian Michaud, Roy E. Clark, Kenneth J. Taylor
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Patent number: 10235054Abstract: A method and systems for caching utilize first and second caches, which may include a dynamic random-access memory (DRAM) cache and a next generation non-volatile memory (NGNVM) cache such as NAND flash memory. The methods and systems may be used for memory caching and/or page caching. The second caches are managed in an exclusive fashion, resulting in an aggregate cache having a storage capacity generally equal to the sum of individual cache storage capacities. Cache free lists may be associated with the first and second page caches and pages within a cache free list may be mapped back to an associated cache without accessing a backing store. Data can be migrated between the first cache and the second caches based upon access heuristics and application hints.Type: GrantFiled: December 9, 2014Date of Patent: March 19, 2019Assignee: EMC IP Holding Company LLCInventors: Roy E. Clark, Adrian Michaud
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Patent number: 10049046Abstract: Methods and apparatus for providing region zero-fill on demand for tiered memory including a first region in a first memory tier having a page cache in physical memory, where virtual memory includes a mmap of the first region. An input can be controlled between zeroes and the first region to the page cache.Type: GrantFiled: September 30, 2014Date of Patent: August 14, 2018Assignee: EMC IP HOLDING COMPANY LLCInventors: Adrian Michaud, Roy E. Clark, Kenneth J. Taylor
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Patent number: 9971709Abstract: Described are techniques for migrating data. A source data storage system includes a source device and a target data storage system includes a target device. A passive path and an active path are provided for a host to access data of a logical device. The host recognizes the passive path and the active path as paths to the logical device. The passive path is between the host and the source data storage system. The active path is between the host and the target data storage system and used in connection with proxying at least some requests directed to the logical device received from the host through the target data storage system while migrating data for the logical device from the source device to the target device. Migrating is performed to migrate data for the logical device from the source device to the target device. Migrating is controlled by a migration module executing on the target data storage system that copies data from the source device to the target device.Type: GrantFiled: September 29, 2015Date of Patent: May 15, 2018Assignee: EMC IP Holding Company LLCInventors: Matthew Long, Roy E. Clark, Dennis Duprey, David Harvey, Walter A. O'Brien, III
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Patent number: 9858193Abstract: A computer-implemented method, computer program product and computing system for defining a cache storage portion within a cache storage device coupled to a computing device. An application storage portion is defined within the cache storage device coupled to the computing device. The cache storage portion is configured to store cache data and the application storage portion is configured to store application data.Type: GrantFiled: May 13, 2016Date of Patent: January 2, 2018Assignee: EMC IP Holding Company LLCInventors: Roy E. Clark, Randall H. Shain, Barry Ader, Daniel S. Cobb
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Patent number: 9811286Abstract: A method, computer program product, and computing system for defining a storage space having a defined capacity within a storage system. The storage system includes a frontend system and a backend system. A first portion of the storage space is located within the frontend system. A second portion of the storage space is located within the backend system. Usage of a data item stored within the storage space is monitored to identify a usage pattern. The data item is migrated to either the first portion of the storage space or the second portion of the storage space based, at least in part, upon the usage pattern.Type: GrantFiled: December 28, 2012Date of Patent: November 7, 2017Assignee: EMC IP Holding Company LLCInventors: Randall H. Shain, Arieh Don, Roy E. Clark, Philip Derbeko, Yaron Dar, Alex Veprinsky
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Patent number: 9672148Abstract: Methods and apparatus to provide application access to a flash device having page cache memory and storage class memory via a bus by mapping a user process virtual address space, wherein the process for the application resides on a host having a processor with direct cache-line access to the page cache memory, wherein the user process virtual address space includes at least a partial mapping of physical address windows for one or more separate flash devices.Type: GrantFiled: June 30, 2014Date of Patent: June 6, 2017Assignee: EMC IP HOLDING COMPANY LLCInventors: Adrian Michaud, Roy E. Clark
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Patent number: 9495292Abstract: A computer-executable method, system, and computer program product of managing a hierarchical data storage system, wherein the data storage system includes a first level of one or more hosts, a second level of one or more storage appliances, and a data storage array, the computer-executable method, system, and computer program product comprising receiving an I/O request from a first host of the one or more hosts, wherein the I/O request relates to a portion of data on the data storage array, analyzing the I/O request to determine a status of the portion of data on the data storage system, based on the determination, providing an update to a second host of the one or more hosts based on the I/O request, wherein the portion of data is cached on the second host of the one or more hosts, and processing I/O request by sending I/O request to data storage array.Type: GrantFiled: December 31, 2013Date of Patent: November 15, 2016Assignee: EMC IP Holding Company, LLCInventors: Randall H. Shain, Roy E. Clark, Alexandr Veprinsky, Arieh Don, Philip Derbeko, Yaron Dar
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Patent number: 9478274Abstract: Methods and apparatus for computer systems having first and second memory tier having regions, physical memory having page caches that are shareable with multiple ones of the regions in the first memory tier and the regions in the second memory tier, and virtual memory having mmaps of ones of the regions in the first memory tier and ones of the regions in the second memory tier, wherein the mmaps are associated with multiple ones of the pages caches.Type: GrantFiled: June 25, 2014Date of Patent: October 25, 2016Assignee: EMC CORPORATIONInventors: Adrian Michaud, Roy E. Clark, Kenneth J. Taylor
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Patent number: 9438688Abstract: A method, computer program product, and computing system for defining a first server and a second server within a server cluster. The first server includes a first cache system and the first and second servers are coupled to a data array that includes a LUN. The LUN is reserved for exclusive access by the first server, thus generating a first server reservation. Data associated with the LUN is cached within the first cache system of the first server. A loss of the first server reservation is sensed. In response to a loss of the first server reservation, the first cache system of the first server is purged.Type: GrantFiled: September 22, 2015Date of Patent: September 6, 2016Assignee: EMC CorporationInventors: Roy E. Clark, Philip Derbeko, Arieh Don, Yaron Dar
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Patent number: 9424175Abstract: A method, computer program product, and computing system for receiving a write request on a first cache system, wherein the write request identifies new content to be written to a data array. A write request content identifier associated with the new content is compared to a plurality of content identifiers included within a content directory for the first cache system to determine if a matching content identifier exists. Each of the plurality of content identifiers is associated with a piece of previously-written content included within the first cache system. If a matching content identifier is identified, content on the data array is copied from a first location on the data array associated with the matching content identifier to a second location on the data array associated with the write request content identifier.Type: GrantFiled: November 30, 2011Date of Patent: August 23, 2016Assignee: EMC CorporationInventors: Roy E. Clark, Alex Veprinsky
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Patent number: 9367452Abstract: A computer-implemented method, computer program product and computing system for defining a cache storage portion within a cache storage device coupled to a computing device. An application storage portion is defined within the cache storage device coupled to the computing device. The cache storage portion is configured to store cache data and the application storage portion is configured to store application data.Type: GrantFiled: September 30, 2011Date of Patent: June 14, 2016Assignee: EMC CorporationInventors: Roy E. Clark, Randall H. Shain, Barry Ader, Daniel S. Cobb
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Patent number: 9367453Abstract: A computer-implemented method, computer program product and computing system for moving at least a portion of cache data from a first cache storage device coupled to a first computing device included within a first virtual machine to a shared storage device. The at least a portion of cache data is moved from the shared storage device to a second cache storage device coupled to a second computing device included within a second virtual machine.Type: GrantFiled: September 30, 2011Date of Patent: June 14, 2016Assignee: EMC CorporationInventors: Roy E. Clark, Randall H. Shain, Robert W. Beauchamp, Michel F. Fisher
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Patent number: 9335941Abstract: A method, system, and computer program product comprising using a tracking structure to map a first portion and a second portion of a non-volatile storage medium to a logical representation of the non-volatile storage medium; wherein the first portion is presented by the logical representation as writable storage and using the tracking structure to enable the logical representation to present the data written to the second portion as the data corresponding to the write in the first portion.Type: GrantFiled: February 25, 2015Date of Patent: May 10, 2016Assignee: EMC CorporationInventor: Roy E Clark
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Patent number: 9268711Abstract: A method, computer program product, and computing system for receiving a read request on a first cache system, wherein the read request identifies previously-written content included within a data array. A read request content identifier associated with the previously-written content identified in the read request is received from the data array. The read request content identifier associated with the previously-written content identified in the read request is compared to a plurality of content identifiers included within a content directory for the first cache system to determine if a matching content identifier exists. Each of the plurality of content identifiers is associated with a piece of previously-written content included within the first cache system.Type: GrantFiled: April 17, 2014Date of Patent: February 23, 2016Assignee: EMC CorporationInventors: Roy E. Clark, Alex Veprinsky
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Patent number: 9268696Abstract: A method, computer program product, and computing system for receiving a read request on a first cache system, wherein the read request identifies previously-written content included within a data array. The previously-written content identified in the read request is obtained from the data array. A read request content identifier is generated for the previously-written content identified in the read request. The read request content identifier associated with the previously-written content identified in the read request is compared to a plurality of content identifiers included within a content directory for the first cache system to determine if a matching content identifier exists. Each of the plurality of content identifiers is associated with a piece of previously-written content included within the first cache system.Type: GrantFiled: April 11, 2014Date of Patent: February 23, 2016Assignee: EMC CorporationInventors: Roy E. Clark, Alex Veprinsky
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Patent number: 9268693Abstract: A method, computer program product, and computing system for receiving a read request on a first cache system, wherein the read request identifies previously-written content included within a data array. If the previously-written content identified in the read request is stored within the first cache system in a compressed format, and the previously-written content identified in the read request is stored within the data array in an uncompressed format; a determination is made as to if it is less computationally expensive to obtain from the data array the previously-written content in an uncompressed format.Type: GrantFiled: March 27, 2014Date of Patent: February 23, 2016Assignee: EMC CorporationInventors: Roy E. Clark, Alex Veprinsky
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Patent number: 9208098Abstract: A method, computer program product, and computing system for receiving a read request on a first cache system, wherein the read request identifies previously-written content included within a data array. The previously-written content identified in the read request may be obtained from the data array. The previously-written content identified in the read request may be compressed, thus generating compressed previously-written content. A compression ratio may be determined for the compressed previously-written content.Type: GrantFiled: November 30, 2011Date of Patent: December 8, 2015Assignee: EMC CorporationInventors: Roy E. Clark, Alex Veprinsky