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    METHOD AND SYSTEM FOR DEADLINE INHERITANCE FOR RESOURCE SYNCHRONIZATION
    1.
    发明申请
    METHOD AND SYSTEM FOR DEADLINE INHERITANCE FOR RESOURCE SYNCHRONIZATION 审中-公开

    公开(公告)号：US20200210240A1

    公开(公告)日：2020-07-02

    申请号：US16815265

    申请日：2020-03-11

    Applicant: EMC IP Holding Company LLC

    Inventor： Alexandr Veprinsky ,  Felix Shvaiger ,  Anton Kucherov ,  Arieh Don

    IPC: G06F9/50

    Abstract: Example embodiments of the present invention provide a method, a system, and a computer program product for managing tasks in a system. The method comprises running a first task on a system, wherein the first task has a first priority of execution time and the execution of which first task locks a resource on the system, and running a second task on the system, wherein the second task has a second priority of execution time earlier than the first priority of execution time of the first task and the execution of which second task requires the resource on the system locked by the first task. The system then may promote the first task having the later first priority of execution time to a new priority of execution time at least as early as the second priority of execution time of the second task and resume execution of the first task having the later first priority of execution time.

    Method and apparatus for asymmetric raid
    2.
    发明授权
    Method and apparatus for asymmetric raid 有权

    公开(公告)号：US10452306B1

    公开(公告)日：2019-10-22

    申请号：US14144651

    申请日：2013-12-31

    Applicant: EMC IP Holding Company LLC

    Inventor： Assaf Natanzon ,  Arieh Don ,  Zvi Gabriel Benhanokh ,  Alexandr Veprinsky ,  Eitan Bachmat

    IPC: G06F3/06 ,  G06F12/00

    Abstract: Example embodiments of the present invention relate to a method, an apparatus, and a computer program product for mirroring data in a data storage system across a first storage device having a first latency and a second storage device having a second latency. The method includes receiving an I/O at the data storage system and controlling the I/O to the first storage device having the first latency or the second storage device having the second latency according to properties of the I/O and properties of the first storage device having the first latency and the second storage device having the second latency.

    Method and system for deadline inheritance for resource synchronization
    4.
    发明授权
    Method and system for deadline inheritance for resource synchronization 有权

    公开(公告)号：US11372682B2

    公开(公告)日：2022-06-28

    申请号：US16815265

    申请日：2020-03-11

    Applicant: EMC IP Holding Company LLC

    Inventor： Alexandr Veprinsky ,  Felix Shvaiger ,  Anton Kucherov ,  Arieh Don

    IPC: G06F9/50

    Abstract: Example embodiments of the present invention provide a method, a system, and a computer program product for managing tasks in a system. The method comprises running a first task on a system, wherein the first task has a first priority of execution time and the execution of which first task locks a resource on the system, and running a second task on the system, wherein the second task has a second priority of execution time earlier than the first priority of execution time of the first task and the execution of which second task requires the resource on the system locked by the first task. The system then may promote the first task having the later first priority of execution time to a new priority of execution time at least as early as the second priority of execution time of the second task and resume execution of the first task having the later first priority of execution time.

    Application level coordination for automated multi-tiering system in a federated environment
    5.
    发明授权
    Application level coordination for automated multi-tiering system in a federated environment 有权

    公开(公告)号：US10552342B1

    公开(公告)日：2020-02-04

    申请号：US13835946

    申请日：2013-03-15

    Applicant: EMC IP Holding Company LLC

    Inventor： Marik Marshak ,  Alexandr Veprinsky

    IPC: G06F12/00 ,  G06F3/06 ,  G06F12/122

    Abstract: Synchronization of data layouts and resource utilizations at one or more remote replica sites with the workload and data access statistics at the primary site allows for an efficient and effective workload support transfer in the event of site failover from a primary site to a remote site. Relevant data access information about workload being supported at the primary site is monitored and access pattern information is generated that provides relevant information about frequency and/or rate of access of data on the primary site. The access pattern information is generated and transmitted by a host and/application running on the host. The access pattern information is exported and imported to enable independent decisions to be made a remote site, storing replicated data from the primary site, on how best to utilize its available resources to match the performance requirements currently being supported by the primary site.

    Method and system for multi-tier all-flash array
    7.
    发明授权
    Method and system for multi-tier all-flash array 有权

    公开(公告)号：US10042751B1

    公开(公告)日：2018-08-07

    申请号：US14871344

    申请日：2015-09-30

    Applicant: EMC IP Holding Company LLC

    Inventor： Alexandr Veprinsky ,  Assaf Natanzon ,  Saar Cohen ,  Arieh Don

    IPC: G06F12/02 ,  G06F13/28

    Abstract: Example embodiments of the present invention relate to a method, a system, and a computer program product for tiering metadata. The method includes selecting a consecutive range of addresses of a logical device having a parent data structure associated therewith maintaining a first set of hash values at a first granularity of the logical device. A second hash value then may be calculated over the consecutive range of addresses of the logical device at a second granularity of the logical device and inserted into a child data structure associated with the parent data structure. Entries in the parent data structure at the first granularity for the consecutive range of addresses then may be freed in favor of the second hash value at the second granularity for the consecutive range of addresses inserted into the child data structure, for storing hash values for other addresses of the logical device.

    Metadata paging mechanism tuned for variable write-endurance flash
    9.
    发明授权
    Metadata paging mechanism tuned for variable write-endurance flash 有权

    公开(公告)号：US10318180B1

    公开(公告)日：2019-06-11

    申请号：US15384445

    申请日：2016-12-20

    Applicant: EMC IP HOLDING COMPANY LLC

    Inventor： Gabriel Benhanokh ,  Assaf Natanzon ,  Alexandr Veprinsky ,  Arieh Don ,  Felix Shvaiger

    IPC: G06F12/00 ,  G06F3/06 ,  G06F12/0802

    Abstract: A storage array uses both high endurance SSDs and low endurance SSDs for metadata paging. Wear cost values are calculated for each page of metadata in cache. The wear cost values are used to select pages for swapping out of the cache to the SSDs. The wear cost values may be calculated as a function of a first term that is indicative of whether the respective page of metadata will be written to high endurance or low endurance SSDs; a second term that is indicative of likelihood of data associated with the respective pages of metadata that will possibly be changed due to a write; and a third term that is indicative of age of the respective page of metadata in the cache since most recent use. The terms may be estimated and independently weighted. The portion of cache allocated for the metadata may be increased to avoid exceeding DWPD targets.

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