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    Data mirroring control apparatus and method
    112.
    发明公开
    Data mirroring control apparatus and method 有权
    数据镜像控制装置和方法

    公开(公告)号：EP2854034A3

    公开(公告)日：2015-09-23

    申请号：EP14186369.6

    申请日：2014-09-25

    Applicant: Samsung Electronics Co., Ltd

    Inventor： Lee, Ju-Pyung

    IPC: G06F11/20

    CPC classification number: G06F3/065 ,  G06F3/0604 ,  G06F3/0659 ,  G06F3/0689 ,  G06F11/2087 ,  G06F2201/825

    Abstract: A data mirroring control apparatus includes a command distributing unit configured to transmit a first write command to a plurality of mirroring storage devices, the first write command including an instruction for data requested by a host to be written; and a memory lock setting unit configured to set a memory lock on the data requested by the host to be written among data stored in a host memory and configured to release the memory lock on the data after the data with the memory lock is written to the plurality of mirroring storage devices.

    Abstract translation: 一种数据镜像控制装置，包括：命令分配单元，用于向多个镜像存储设备发送第一写入命令，所述第一写入命令包括主机写入请求数据的指令; 以及存储器锁定设置单元，被配置为对存储在主机存储器中的数据当中要写入的主机请求的数据设置存储器锁定，并且被配置为在具有存储器锁定的数据写入到存储器锁定之后解除对数据的存储器锁定 多个镜像存储设备。

    Transaction processing system and method with reduced locking
    119.
    发明授权
    Transaction processing system and method with reduced locking 失效
    的系统和方法具有降低的锁定事务处理

    公开(公告)号：EP0442715B1

    公开(公告)日：1997-12-10

    申请号：EP91301147.4

    申请日：1991-02-13

    Applicant: International Business Machines Corporation

    Inventor： Mohan, Chandrasekaran

    IPC: G06F17/30 ,  G06F9/46

    CPC classification number: G06F9/466 ,  G06F9/526 ,  G06F2201/825 ,  G06F2201/87 ,  Y10S707/99938

    Abstract: Apparatus and method for reading data pages 33 in a transaction processing system 20 without locking the pages are disclosed. The system maintains a Global_Committed_LSN 36 identifying the oldest uncommitted transaction accessing any of the data, and Object_Committed_LSNs 38a,38b identifying the oldest uncommitted transactions accessing particular files, tables and indexes. Each data page includes a Page_LSN 35 identifying the last transaction to have updated the page. To read a page, a transaction first latches the pages, and compares the page s Page_LSN with the Global_Committed_LSN, or with the page's respective Object_Committed_LSN. If the Page_LSN is older than the Committed_LSN with which is was compared, then the transaction reads the page without locking it, since there can be no uncommitted transaction in process which might have updated the page's data. However if the Page_LSN is younger than the Committed_LSN, the page is locked before being read.

    Integrity of data objects used to maintain state information for shared data at a local complex
    120.
    发明公开
    Integrity of data objects used to maintain state information for shared data at a local complex 失效
    数据对象的完整性，用于维护本地复合数据的维护状态信息

    公开(公告)号：EP0563621A3

    公开(公告)日：1995-11-15

    申请号：EP93103643.8

    申请日：1993-03-08

    Applicant: International Business Machines Corporation

    Inventor： Elko, David Arlen ,  Frey, Jeffrey Alan ,  Helffrich, Audrey Ann ,  Nick, Jeffrey Mark ,  Swanson, Michael Dustin

    IPC: G06F11/00 ,  G06F12/08

    CPC classification number: G06F12/0813 ,  G06F11/2007 ,  G06F11/22 ,  G06F11/2205 ,  G06F2201/825

    Abstract: Apparatus and method insuring that data objects used to maintain state information for shared data at a local central processing complex (CPC) is coherent with respect to state information maintained at a structured external storage facility (SES) over a link is valid. An error detector is attached to the CPC side of the link for detecting errors on the link, and, when an error is detected, setting a error state pending (ESP) latch to indicate that the link has failed and that the shared data in the local data object may be invalid because a message invalidating the data may not have been received by the CPC. In data processing operations, the ESP latch is interrogated by a central processor in the CPC to determine the health of the message path to the SES facility. A local cache vector reflecting the validity of the shared data in the local cache may then be interrogated to determine if the shared data in the local cache is valid. If a healthy path has continuously existed and the vector indicates that the local cache data is valid, the integrity of the data can be relied on.

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