TECHNIQUE FOR EFFICIENTLY INDEXING DATA OF AN ARCHIVAL STORAGE SYSTEM

    公开(公告)号:EP4124968A1

    公开(公告)日:2023-02-01

    申请号:EP22187472.0

    申请日:2022-07-28

    Applicant: Nutanix, Inc.

    Abstract: An indexing technique provides an index data structure for efficient retrieval of a snapshot from a long-term storage service (LTSS) of an archival storage system. The snapshot is generated from typed data of a logical entity, such as a virtual disk (vdisk). The data of the snapshot is replicated to a frontend data service of the LTSS sequentially and organized as one or more data objects for storage by a backend data service of LTSS in an object store of the archival storage system. Metadata associated with the snapshot (i.e., snapshot metadata) is recorded as a log and persistently stored on storage media local to the frontend data service. The snapshot metadata includes information describing the snapshot data, e.g., a logical offset range of a snapshot of the vdisk and, thus, is used to construct the index data structure. Notably, construction of the index data structure is deferred until after the entirety of the snapshot data has been replicated and received by the frontend data service.

    TAKE-UP UNIT FOR CIRCULAR KNITTING MACHINE AND CONTROL METHOD OF DRIVE ROLLER IN THE TAKE-UP UNIT

    公开(公告)号:EP4124683A1

    公开(公告)日:2023-02-01

    申请号:EP22187400.1

    申请日:2022-07-28

    Abstract: A take-up unit (3) for a circular knitting machine collects a knitted fabric knitted by a knitting unit of a circular knitting machine, and includes an arm drive device (35) connected to arm rotation shafts (331). The arm drive device (35) is capable of rotating arms (332) with a constant torque selectively in either a forward direction or a backward direction. A drive roller (33) moves toward a take-up roller (32) when the arms (332) are rotated in the forward direction, and the drive roller (33) moves away from the take-up roller (32) when the arms (332) are rotated in the backward direction. The take-up unit (3) further includes a stopper (37) that is provided on a rotational trajectory of the arms (32) and the drive roller (33), and that comes into contact with the arms (32) and the drive roller (33) to stop the rotation thereof.

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