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    1.
    发明专利
    未知

    公开(公告)号：DE3689664T2

    公开(公告)日：1994-08-18

    申请号：DE3689664

    申请日：1986-10-07

    Applicant: IBM

    Inventor： GLADNEY HENRY MARTIN ,  MATTSON RICHARD LEWIS ,  LORCH DOUGLAS JEFFREY

    IPC: G06F12/00 ,  G06F17/30 ,  G06F15/40

    Abstract: An apparatus and method for managing obsolescence of replicas of data objects in a distributed processing system having a network of nodes connected by communication links, at least one node (6,7,8) operating as a source location having access to source data objects and at least one other node (1) operating as a replica location having a means for storing replicas of source data objects received from a source location is disclosed. The apparatus comprises manager means, in communication with a source location, for maintaining obsolescence data identifying obsolete replicas; means at a requesting replica location for generating a request for at least a portion of said obsolescence data; and server means, in communication with said manager means and the requesting replica location and responsive to obsolescence requests, for supplying the requested portion of obsolescence data to the requesting replica location in the form of an atomic demand/response transaction.

    METHOD AND MEANS FOR DISTRIBUTED SPARING IN DASD ARRAYS
    2.
    发明专利
    METHOD AND MEANS FOR DISTRIBUTED SPARING IN DASD ARRAYS 未知

    公开(公告)号：CA2063897C

    公开(公告)日：1998-05-05

    申请号：CA2063897

    申请日：1992-03-24

    Applicant: IBM

    Inventor： MENON JAISHANKAR MOOTHEDATH ,  MATTSON RICHARD LEWIS ,  NG SPENCER WAH-FUNG

    IPC: G06F12/16 ,  G06F3/06 ,  G06F11/10 ,  G06F11/20 ,  G11C29/00 ,  G11B20/18

    Abstract: A method and means in which data and parity blocks forming parity groups together with spare blocks are distributed over array block locations according to at least one combinatorial design, each group having N data and P parity blocks. The combinatorial designs yield uniform or balanced loading thereby minimizing the number of accesses to reconstruct missing data and parity blocks and their copyback into spare block locations, and, minimize the number of accesses to the reconstructed data referenced subsequent to its copyback. Distributions of the spare block capacity of one or two DASDs are shown over single and multiple arrays and shared among multiple arrays. Parity block distribution although ancillary to spare distribution enhances throughput and reduces the number of accesses for rebuild etc.

    5.
    发明专利
    未知

    公开(公告)号：DE3689664D1

    公开(公告)日：1994-03-31

    申请号：DE3689664

    申请日：1986-10-07

    Applicant: IBM

    Inventor： GLADNEY HENRY MARTIN ,  MATTSON RICHARD LEWIS ,  LORCH DOUGLAS JEFFREY

    IPC: G06F12/00 ,  G06F17/30 ,  G06F15/40

    Abstract: An apparatus and method for managing obsolescence of replicas of data objects in a distributed processing system having a network of nodes connected by communication links, at least one node (6,7,8) operating as a source location having access to source data objects and at least one other node (1) operating as a replica location having a means for storing replicas of source data objects received from a source location is disclosed. The apparatus comprises manager means, in communication with a source location, for maintaining obsolescence data identifying obsolete replicas; means at a requesting replica location for generating a request for at least a portion of said obsolescence data; and server means, in communication with said manager means and the requesting replica location and responsive to obsolescence requests, for supplying the requested portion of obsolescence data to the requesting replica location in the form of an atomic demand/response transaction.

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