Patents by Inventor Alan L. Taylor

Alan L. Taylor 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: 20220236877
    Abstract: A technique for maintaining synchronization between two arrays includes assigning one array to be a preferred array and the other array to be a non-preferred array. When write requests are received at the preferred array, the writes are applied locally first and then applied remotely. However, when write requests are received at the non-preferred array, such writes are applied remotely first and then applied locally. Thus, writes are applied first on the preferred array and then on the non-preferred array, regardless of whether the writes are initially received at the preferred array or the non-preferred array.
    Type: Application
    Filed: January 22, 2021
    Publication date: July 28, 2022
    Inventors: Nagasimha Haravu, Alan L. Taylor, David Meiri, Dmitry Nikolayevich Tylik
  • Publication number: 20220229734
    Abstract: Techniques for creating and using snapshots may include: receiving a request to create a new snapshot of a source object; determining whether a first generation identifier associated with the source object matches a second generation identifier associated with a base snapshot of the source object; determining whether the source object has been modified since the base snapshot was created; and responsive to determining the first generation identifier matches the second generation identifier and also determining that the source object has not been modified since the base snapshot was created, associating the new snapshot with the base snapshot thereby indicating that the new snapshot and the base snapshot have matching content and denote a same point in time copy of the source object.
    Type: Application
    Filed: January 19, 2021
    Publication date: July 21, 2022
    Applicant: EMC IP Holding Company LLC
    Inventors: Nagapraveen Veeravenkata Seela, Alan L. Taylor, Nagasimha G. Haravu, Michael C. Brundage
  • Patent number: 11372573
    Abstract: A method, computer program product, and computer system for receiving, at a computing device, a write request from a host, wherein a first portion of a process may receive the write request. A callback and context may be set in the write request by the first portion of the process. The write request may be passed to a second portion of the process. The first process may be provided with the context. The first process may use the context to replicate the write request data to a destination.
    Type: Grant
    Filed: July 10, 2020
    Date of Patent: June 28, 2022
    Assignee: EMC IP HOLDING COMPANY, LLC
    Inventors: Alan L. Taylor, Michael C. Brundage, Nagapraveen Veeravenkata Seela, William C. Davenport, Xiangping Chen, Xunce Zhou
  • Publication number: 20220011937
    Abstract: A method, computer program product, and computer system for receiving, at a computing device, a write request from a host, wherein a first portion of a process may receive the write request. A callback and context may be set in the write request by the first portion of the process. The write request may be passed to a second portion of the process. The first process may be provided with the context. The first process may use the context to replicate the write request data to a destination.
    Type: Application
    Filed: July 10, 2020
    Publication date: January 13, 2022
    Inventors: ALAN L. TAYLOR, Michael C. Brundage, Nagapraveen Veeravenkata Seela, William C. Davenport, Xiangping Chen, Xunce Zhou
  • Patent number: 11099777
    Abstract: Techniques for providing a unified approach to an orchestration of services for accomplishing data import tasks, data replication tasks, and/or data migration tasks in a clustered storage environment. The techniques are employed in a clustered storage environment that includes one or more storage domains, each of which includes, as members of the storage domain, a primary storage appliance and one or more secondary storage appliances. By providing, in a primary storage appliance of a storage domain within a clustered storage environment, an orchestrator for orchestrating a set of orchestration phases, which can be shared to perform data import tasks, data replication tasks, and/or data migration tasks involving a foreign storage system deployed outside of the clustered storage environment and/or one or more data storage appliance deployed within the clustered storage environment, enhanced efficiencies due to infrastructure sharing within the clustered storage environment can be achieved.
    Type: Grant
    Filed: July 30, 2018
    Date of Patent: August 24, 2021
    Assignee: EMC IP Holding Company LLC
    Inventors: Nagasimha Haravu, Girish Sheelvant, Nagapraveen V. Seela, Alan L. Taylor
  • Patent number: 10782997
    Abstract: A method, computer program product, and computing system for receiving an control plane request on a layered services architecture that includes a plurality of discrete services and a rules engine. The control plane request is processed with the rules engine to identify one or more mandatory services, chosen from the plurality of discrete services, required to process the control plane request. The one or more mandatory services are sequenced to form a services workflow. The control plane request is processed based upon the services workflow.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: September 22, 2020
    Assignee: EMC IP Holding Company, LLC
    Inventors: Sathya Krishna Murthy, Alan L. Taylor, Nagasimha G. Haravu
  • Patent number: 10706169
    Abstract: Techniques are presented for implementing a scalable approach to keeping track of the metadata validity of persistently-stored metadata for storage objects. In contrast with prior approaches, improved techniques only store a list of the invalid (or quarantined) objects rather than all objects regardless of validity of their metadata. Under normal circumstances, only a small number of storage objects are invalid at any given time, as the system generally takes steps to repair the invalid objects in the normal course of operation. Thus, the number of invalid objects tends to be small, barring some catastrophic system failure. Only a small amount of expensive privileged persistent storage is therefore needed. A health level may also be used to indicate many failures, indicative of catastrophic system failure.
    Type: Grant
    Filed: December 31, 2018
    Date of Patent: July 7, 2020
    Assignee: EMC IP Holding Company LLC
    Inventors: Michael Paul Wagner, Michael C. Brundage, Alan L. Taylor, Michael J. Noeth, Peter J. McCann, Steven A. Morley
  • Publication number: 20200210606
    Abstract: Techniques are presented for implementing a scalable approach to keeping track of the metadata validity of persistently-stored metadata for storage objects. In contrast with prior approaches, improved techniques only store a list of the invalid (or quarantined) objects rather than all objects regardless of validity of their metadata. Under normal circumstances, only a small number of storage objects are invalid at any given time, as the system generally takes steps to repair the invalid objects in the normal course of operation. Thus, the number of invalid objects tends to be small, barring some catastrophic system failure. Only a small amount of expensive privileged persistent storage is therefore needed. A health level may also be used to indicate many failures, indicative of catastrophic system failure.
    Type: Application
    Filed: December 31, 2018
    Publication date: July 2, 2020
    Inventors: Michael Paul Wagner, Michael C. Brundage, Alan L. Taylor, Michael J. Noeth, Peter J. McCann, Steven A. Morley
  • Patent number: 10678576
    Abstract: A technique for managing data storage for virtual machines in a data storage system includes receiving, from a virtual machine administrative program, a request to operate a virtual machine disk (VMD) at a different service level from one at which the data storage system is currently operating the VMD. In response to receiving the request, the data storage system migrates the VMD from a first set of storage extents providing a first service level to a second set of storage extents providing a second service level.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: June 9, 2020
    Assignee: EMC IP Holding Company LLC
    Inventors: Alan L. Taylor, Anil K. Koluguri, William C. Whitney, Arun Joseph, William S. Burney, Somchai Pitchayanonnetr
  • Patent number: 10564847
    Abstract: Techniques are described for performing a copy operation. A first request is received to perform a copy operation to copy source data from a source area to a target area. The first request is partitioned into a plurality of other requests. Each of the plurality of other requests being a request to copy a portion of source data located in the source area to a corresponding location in the target area. A first number of the other requests is issued. Responsive to the issued requests, a copy operation is performed to copy a portion of the source data from the source area to the target area. Completion of a second number of the issued other requests is detected. The second number corresponds to a fraction of the first number such that the second number is greater than one and less than the first number. Upon detecting completion of the second number, a third number of the other requests is issued to copy another portion of the source data from the source area to the target area.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: February 18, 2020
    Assignee: EMC IP Holding Company LLC
    Inventors: Alan L. Taylor, Karl M. Owen, H. Austin Spang, IV
  • Patent number: 10552071
    Abstract: A data path for each storage object may be customized for the particular services enabled for the storage object. Techniques for determining and using data paths may include: receiving an administrative command on a control path, wherein the administrative command is a request to perform any of enable, disable and modify a data service for a first storage object; determining, in accordance with the administrative command, a modification to be made to a current configuration of a data path for the first storage object in order to implement the administrative command, wherein the current configuration includes a plurality of components forming a call stack invoked in connection with I/O processing for I/Os directed to the first storage object; and modifying the data path in accordance with the modification determined.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: February 4, 2020
    Assignee: EMC IP Holding Company LLC
    Inventors: Nagasimha G. Haravu, Alan L. Taylor
  • Publication number: 20200034077
    Abstract: Techniques for providing a unified approach to an orchestration of services for accomplishing data import tasks, data replication tasks, and/or data migration tasks in a clustered storage environment. The techniques are employed in a clustered storage environment that includes one or more storage domains, each of which includes, as members of the storage domain, a primary storage appliance and one or more secondary storage appliances. By providing, in a primary storage appliance of a storage domain within a clustered storage environment, an orchestrator for orchestrating a set of orchestration phases, which can be shared to perform data import tasks, data replication tasks, and/or data migration tasks involving a foreign storage system deployed outside of the clustered storage environment and/or one or more data storage appliance deployed within the clustered storage environment, enhanced efficiencies due to infrastructure sharing within the clustered storage environment can be achieved.
    Type: Application
    Filed: July 30, 2018
    Publication date: January 30, 2020
    Inventors: Nagasimha Haravu, Girish Sheelvant, Nagapraveen V. Seela, Alan L. Taylor
  • Patent number: 10180790
    Abstract: A technique for copying a source data object within a data storage system to a destination includes ingesting data portions of the source object into respective pages of a cache. The cache associates the pages with respective descriptors and writes into the descriptors locations of storage elements that have been provided for storing the respective data portions at the destination. When later flushing these cache pages, each page is flushed to the location at the destination that is provided in the respective descriptor.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: January 15, 2019
    Assignee: EMC IP Holding Company LLC
    Inventors: Alan L. Taylor, David Haase, Michael C. Brundage, Somnath A. Gulve
  • Patent number: 10157020
    Abstract: Techniques are described for copying data. At a first storage processor, a copy request is received to copy data including copying source data from a source area of a source logical device to a destination area of a destination logical device. The source logical device is owned by the first storage processor and the destination logical device is owned by a second storage processor. The first storage processor receives, from the second storage processor, destination location physical storage mapping information for the destination area. A destination physical device location corresponding to the destination area is determined. The source data from the source area is stored in a first cache location of a first data cache of the first storage processor. The first cache location is modified to indicate it includes write pending data for the destination physical device location. The source data is destaged to the destination physical device location.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: December 18, 2018
    Assignee: EMC IP Holding Company LLC
    Inventors: Alan L. Taylor, Karl M. Owen, Arun Joseph, William S. Burney
  • Patent number: 10055166
    Abstract: There are disclosed techniques for use in managing data copying. In one embodiment, there is disclosed a method including a number of steps. The method comprises performing a first operation to copy data from a first region of a source area. The method also comprises determining a count relating to pending I/O requests in connection with a second region of the source area upon completion of the first operation. And, in response to determining that the count relating to pending I/O requests in connection with the second region of the source area equals zero, the method further comprises performing a second operation to copy data from the second region of the source area and configuring a new region in the source area to record a count relating to pending I/O requests in connection with the source area.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: August 21, 2018
    Assignee: EMC IP Holding Company LLC
    Inventors: Alan L. Taylor, David Haase, Michael C. Brundage, Somnath A. Gulve, Varun K. Chinta
  • Patent number: 9933953
    Abstract: A technique for managing copy sessions in a data storage system supports active and inactive copy-session states and reclaims memory for inactive copy sessions to reduce their memory footprints. When a copy session transitions from the active state to the inactive state, the copy session persists certain copy-progress data in non-volatile storage and frees structures in memory previously storing that copy-progress data. The inactive copy session continues to run but performs no copying and consumes less memory. When the copy session later transitions back to the active state, the copy session reads the copy-progress data back into memory and resumes copying.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: April 3, 2018
    Assignee: EMC IP Holding Company LLC
    Inventors: Alan L. Taylor, Paul T. McGrath, David Haase, Michael C. Brundage, Somnath A. Gulve, Michael Paul Wagner
  • Patent number: 9916112
    Abstract: A copy technique involves generating, upon receiving a command to copy at least a portion of a source file, a set of pointers for a destination file that point to a set of pointers for the source file (“physical block pointers”), which in turn point to physical blocks storing data of the file in a storage system. In response to the copy command, a storage processor allocates an inode from an inode table of a file system for the destination file and stores a set of inode pointers in the inode of the destination file that point to the set of pointers for the source file. Thus, instead of creating a redundant copy of the data of the source file, the improved creates technique creates pointers that point to the data stored for the source file.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: March 13, 2018
    Assignee: EMC IP Holding Company LLC
    Inventors: Alan L. Taylor, Karl M. Owen, Samuel Mullis
  • Patent number: 9804797
    Abstract: The subject disclosure is generally directed towards load balancing between storage processors based upon dynamic redirection statistics, in which load balancing includes changing a preferred path/a mounted file system from one storage processor to another. In one example, load balancing technology compares a current delta of directed and redirected I/O counts to a previous delta. If the result turns from negative to positive, that is, redirection is becoming prevalent, a load balancing threshold may be changed based upon the current delta value. Load balancing is thus based on the latest trend of I/O redirection.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: October 31, 2017
    Assignee: EMC IP Holding Company LLC
    Inventors: Timothy C. Ng, Alan L. Taylor, Nagapraveen V. Seela
  • Patent number: 9658803
    Abstract: A method is used in managing accesses to storage. An amount of data storage space in use by a mapped logical volume and RAID group characteristics of a storage pool used by the mapped logical volume are determined. Based on the amount and the RAID group characteristics, a report of storage resources corresponding to the mapped logical volume is produced. Based on the report, accesses to the mapped logical volume are controlled.
    Type: Grant
    Filed: June 28, 2012
    Date of Patent: May 23, 2017
    Assignee: EMC IP Holding Company LLC
    Inventors: Alan L. Taylor, Michael D. Haynes, Miles A. DeForest, David W. Harvey, Dennis T. Duprey
  • Patent number: 9619286
    Abstract: Techniques for processing requests are described. A first thread is selected for execution. Only a single thread is allowed to execute at a time. Each thread is associated with a queue of requests to be processed by the thread. A first request is selected from the queue of first thread that performs first processing to service the first request. A service time classification for the first request is determined in accordance with criteria that includes a runtime determination of what resource(s) are used in servicing the first request. It is determined, in accordance with the service time classification, whether to allow the first thread to continue execution and process a second request from the queue of the first thread. If the first thread is allowed to continue execution, second processing is performed by the first thread to service the second request. Otherwise, a second thread is selected for execution.
    Type: Grant
    Filed: March 20, 2014
    Date of Patent: April 11, 2017
    Assignee: EMC IP Holding Company LLC
    Inventors: Michael P. Wagner, David Haase, Charles C. Bailey, Michael C. Brundage, Alan L. Taylor, Chung-Huy Chen, Dennis T. Duprey