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    GARBAGE COLLECTION IN A STORAGE SYSTEM
    35.
    发明申请
    GARBAGE COLLECTION IN A STORAGE SYSTEM 有权

    公开(公告)号：US20130346720A1

    公开(公告)日：2013-12-26

    申请号：US14015308

    申请日：2013-08-30

    Applicant: PURE Storage, Inc.

    Inventor： John Colgrove ,  John Hayes ,  Ethan Miller ,  Cary Sandvig ,  Joseph S. Hasbani ,  Feng Wang

    IPC: G06F12/02

    CPC classification number: G06F12/0253 ,  G06F3/0608 ,  G06F3/061 ,  G06F3/0641 ,  G06F3/065 ,  G06F3/0665 ,  G06F3/067 ,  G06F3/0688 ,  G06F17/30156 ,  G06F2212/702

    Abstract: A system and method for performing garbage collection. A system includes a storage medium, a first table including entries which map a virtual address to locations in the storage medium, and a second table with entries which include a reverse mapping of a physical address in a data storage medium to one or more virtual addresses. A storage controller is configured to perform garbage collection. During garbage collection, the controller is configured to identify one or more entries in the second table which correspond to a segment to be garbage collected. In response to determining the first table includes a valid mapping for a virtual address included in an entry of the one of the one or more entries, the controller is configured to copy data from a first location identified in the entry to a second location in the data storage medium, and reclaim the first storage location.

    Restoring snapshots in a storage system
    38.
    发明授权
    Restoring snapshots in a storage system 有权

    公开(公告)号：US10235093B1

    公开(公告)日：2019-03-19

    申请号：US15484243

    申请日：2017-04-11

    Applicant: Pure Storage, Inc.

    Inventor： John Colgrove ,  Ethan Miller ,  John Hayes ,  Cary Sandvig ,  Christopher Golden ,  Jianting Cao

    IPC: G06F3/06

    Abstract: A system and method for creating and managing snapshots. Mediums are recorded and maintained, all of which are read-only except for the most recent mediums in use by a volume. Multiple volumes may be maintained, including a first volume which points to a first medium. When a snapshot of the first volume is taken, a second medium is created that points to the first medium. The first volume is also updated to point to the second medium. The first medium becomes the underlying medium of the second medium, and lookups are performed initially on the second medium and then on the first medium if the data is not located in the second medium.

    Identifying fractal regions across multiple storage devices
    39.
    发明授权
    Identifying fractal regions across multiple storage devices 有权

    公开(公告)号：US10089010B1

    公开(公告)日：2018-10-02

    申请号：US15682759

    申请日：2017-08-22

    Applicant: Pure Storage, Inc.

    Inventor： Ethan Miller ,  John Colgrove ,  John Hayes ,  Cary Sandvig

    IPC: G06F12/00 ,  G06F3/06 ,  G06F12/1009

    Abstract: A system, method, and computer-readable storage medium for mapping block numbers within a region to physical locations within a storage system. Block numbers are mapped within a region according to a fractal-based space-filling curve. If the region is not a 2k by 2k square, then the region is broken up into one or more 2k by 2k squares. Any remaining sub-region is centered within a 2k by 2k square, the 2k by 2k square is numbered using a fractal-based space-filling curve, and then the sub-region is renumbered by assigning numbers based on the order of the original block numbers of the sub-region.

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