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    Handling zero fault tolerance events in machines where failure likely results in unacceptable loss
    61.
    发明授权
    Handling zero fault tolerance events in machines where failure likely results in unacceptable loss 有权

    公开(公告)号：US10417069B2

    公开(公告)日：2019-09-17

    申请号：US15829701

    申请日：2017-12-01

    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION

    Inventor： Clint A. Hardy ,  Matthew G. Borlick ,  Adrian C. Gerhard ,  Lokesh M. Gupta

    IPC: G06F11/07 ,  G06F11/10 ,  G06F9/50 ,  G06F3/06

    Abstract: Provided are a computer program product, system, and method for managing I/O requests to a storage array of storage devices in a machine having a processor node and device adaptor. In response to initiating a rebuild of data in the storage array, the device adaptor determines whether a remaining fault tolerance at the storage array comprises a non-zero fault tolerance that permits at least one further storage device to fail and still allow recovery of data stored in the storage array. In response to determining that the remaining fault tolerance is a zero fault tolerance that does not permit at least one storage device to fail and allow recovery of data, the device adaptor sends a message to the processor node to cause the processor node to initiate an emergency protocol to terminate a mission critical operation when the processor node is performing the mission critical operation.

    Operating a RAID array with unequal stripes
    62.
    发明授权
    Operating a RAID array with unequal stripes 有权

    公开(公告)号：US10372368B2

    公开(公告)日：2019-08-06

    申请号：US15292202

    申请日：2016-10-13

    Applicant: International Business Machines Corporation

    Inventor： Robert Galbraith ,  Adrian C. Gerhard ,  Daniel F. Moertl

    IPC: G06F3/06 ,  G06F11/10

    Abstract: Operating a RAID array with unequal stripes, the RAID array comprising N number of drives, where each RAID stripe includes P number of parity drives and N-P number of data drives, including buffering, by a RAID controller, write operations received from a host, each write operation specifying data to be written to the RAID array; distributing, by the RAID controller, the data to be written amongst N-P write groups, including: dividing the data into chunks of a sub-stripe size, wherein the sub-stripe size is less than a parity stripe size; and assigning the chunks, in round-robin order, to the N-P write groups; calculating parity from the N-P write groups; and writing the N-P write groups and the calculated parity as a first RAID stripe to the RAID array.

    Dynamic tier remapping of data stored in a hybrid storage system
    64.
    发明授权
    Dynamic tier remapping of data stored in a hybrid storage system 有权

    公开(公告)号：US10067880B2

    公开(公告)日：2018-09-04

    申请号：US15055770

    申请日：2016-02-29

    Applicant: International Business Machines Corporation

    Inventor： Joseph R. Edwards ,  Robert Galbraith ,  Adrian C. Gerhard ,  Daniel F. Moertl ,  Gowrisankar Radhakrishnan ,  Rick A. Weckwerth

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

    Abstract: Disclosed are embodiments for supporting dynamic tier remapping of data stored in a hybrid storage system. One embodiment includes a storage controller and firmware, where the firmware maintains a plurality of mapping elements, where each mapping element includes a plurality of group identifiers, where each group identifier is configured to indicate a mapping of a logical block addresses, and where the storage controller performs: receiving a read command including a logical block address; parsing the logical block address to determine a mapping element and a group identifier; determining, for a particular mapping element of the plurality of elements, whether the particular mapping element is locked, wherein the particular mapping element corresponds to the mapping element of the logical block address; and dependent upon the particular mapping element, queuing the read command for firmware processing or remapping the logical block address.

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