Mirroring data to survive storage device failures

    公开(公告)号:US11663097B2

    公开(公告)日:2023-05-30

    申请号:US17682807

    申请日:2022-02-28

    Abstract: Ensuring resiliency to storage device failures in a storage system, including: determining a number of storage device failures within a particular write group that are to be tolerated by the storage system; for a plurality of datasets stored within the storage system, writing each dataset to at least a predetermined number of storage devices within the particular write group, wherein the predetermined number of storage devices is greater than the number of storage device failures within the particular write group that are to be tolerated by the storage system; and responsive to recovering from a system interruption: determining a number of readable storage devices that contain a copy of the dataset; and if the number of readable storage devices that contain a copy of the dataset is not greater than the number of failures that are to be tolerated, writing the dataset to one or more additional storage devices.

    Preserving tolerance to storage device failures in a storage system

    公开(公告)号:US11263096B1

    公开(公告)日:2022-03-01

    申请号:US16937354

    申请日:2020-07-23

    Abstract: Ensuring resiliency to storage device failures in a storage system, including: determining a number of storage device failures within a particular write group that are to be tolerated by the storage system; for a plurality of datasets stored within the storage system, writing each dataset to at least a predetermined number of storage devices within the particular write group, wherein the predetermined number of storage devices is greater than the number of storage device failures within the particular write group that are to be tolerated by the storage system; and responsive to recovering from a system interruption: determining a number of readable storage devices that contain a copy of the dataset; and if the number of readable storage devices that contain a copy of the dataset is not greater than the number of failures that are to be tolerated, writing the dataset to one or more additional storage devices.

    Policy based path management
    25.
    发明授权

    公开(公告)号:US10992533B1

    公开(公告)日:2021-04-27

    申请号:US15883789

    申请日:2018-01-30

    Abstract: Policy based path management, including: identifying a plurality of data communications paths between a storage system and an entity that issues input/output (‘I/O’) operations to the storage system; selecting, in dependence upon a path selection policy, a subset of data communications paths from the plurality of data communications paths between the entity and the storage system; and issuing, from the entity to the storage system, I/O operations using only the subset of data communications paths.

    Maintaining metadata resiliency among storage device failures

    公开(公告)号:US10467107B1

    公开(公告)日:2019-11-05

    申请号:US15800451

    申请日:2017-11-01

    Abstract: Maintaining metadata consistency among storage devices failures, which includes: for each of a plurality of datasets: writing, on different storage devices of a respective write group, a respective plurality of copies of a respective dataset corresponding to a respective identifier, where at least one copy of the respective dataset remains readable after less than a threshold number of storage device failures within the write group; and responsive to recovering from a system interruption: generating a catalog of valid datasets based on one or more identifiers stored among readable storage devices of the respective write groups.

    Optimizing for data reduction in a storage system

    公开(公告)号:US11281375B1

    公开(公告)日:2022-03-22

    申请号:US16456719

    申请日:2019-06-28

    Abstract: Intelligently compressing data in a storage array that includes a plurality of storage devices, including: prioritizing, in dependence upon an expected benefit to be gained from compressing each data element, one or more data elements; receiving an amount of processing resources available for compressing the one or more of the data elements; and selecting, in dependence upon the prioritization of the one or more data elements and the amount of processing resources available for compressing one or more of the data elements, a data compression algorithm to utilize on one or more of the data elements.

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