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    Virtual storage drive management in a data storage system
    11.
    发明专利
    Virtual storage drive management in a data storage system 未知

    公开(公告)号：GB2584064A

    公开(公告)日：2020-11-18

    申请号：GB202014835

    申请日：2019-02-15

    Applicant: IBM

    Inventor： MATTHEW BORLICK ,  LOKESH GUPTA ,  KEVIN JOHN ASH ,  KARL ALLEN NIELSEN

    IPC: G06F11/10 ,  G06F3/06

    Abstract: In one embodiment, virtual storage drives are allocated to RAID arrays so that no two virtual storage drives of a RAID array are mapped to the same physical storage drive. In another aspect, error handling routines are limited to virtual storage drives impacted by an error in a physical storage drive so that virtual storage drives of the physical storage drive not impacted by the error are bypassed. In yet another aspect, cache operations to a target virtual storage drive may be throttled as a function of both a limit imposed on cache operations directed to the RAID array to which the virtual storage drive is allocated, and a separate limit on cache operations directed to a group of virtual storage drives which are mapped to the same physical storage drive as the target virtual storage drive. Other features and aspects may be realized, depending upon the particular application.

    Destaging tracks with holes in storage system
    12.
    发明专利
    Destaging tracks with holes in storage system 未知

    公开(公告)号：GB2591424A

    公开(公告)日：2021-07-28

    申请号：GB202106810

    申请日：2019-09-30

    Applicant: IBM

    Inventor： LOKESH GUPTA ,  KYLER ANDERSON ,  KEVIN JOHN ASH ,  MATTHEW BORLICK

    IPC: G06F12/08

    Abstract: A machine learning module receives inputs comprising attributes of a storage controller, where the attributes affect performance parameters for performing stages and destages in the storage controller. In response to an event, the machine learning module generates, via forward propagation, an output value that indicates whether to fill holes in a track of a cache by staging data to the cache prior to destage of the track. A margin of error is calculated based on comparing the generated output value to an expected output value, where the expected output value is generated from an indication of whether it is correct to fill holes in a track of the cache by staging data to the cache prior to destage of the track. An adjustment is made of weights of links that interconnect nodes of the plurality of layers via back propagation to reduce the margin of error.

    Using track locks and stride group locks to manage cache operations
    13.
    发明专利
    Using track locks and stride group locks to manage cache operations 未知

    公开(公告)号：GB2585320B

    公开(公告)日：2021-06-09

    申请号：GB202017405

    申请日：2019-04-01

    Applicant: IBM

    Inventor： LOKESH GUPTA ,  MATTHEW BORLICK ,  KEVIN JOHN ASH

    IPC: G06F12/0866 ,  G06F3/06 ,  G06F12/0895

    Abstract: Provided are a computer program product, system, and method for using track locks and stride group locks to manage cache operations. A group of tracks from the storage devices are stored in a cache. Exclusive track locks for tracks in the group in the cache are granted for writes to the tracks in the group in the cache, wherein exclusive track locks can be simultaneously held for writes to different tracks in the cache. An exclusive group lock for the group of tracks in the cache is granted to destage the tracks in the group from the cache to the storage devices. The exclusive group lock is released in response to completing the destage of the tracks in the group in the cache to the storage devices.

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