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1. 发明授权

US07536507B1 Methods, systems, and computer program products for preserving atomic writes using leaves and bitmaps 有权
标题翻译：用于使用树叶和位图保留原子写入的方法，系统和计算机程序产品
公开(公告)号：US07536507B1
公开(公告)日：2009-05-19
申请号：US11393467
申请日：2006-03-30
申请人： Michael P. Wagner , Dave Harvey , Sriram Nagasubramanian
发明人： Michael P. Wagner , Dave Harvey , Sriram Nagasubramanian
IPC分类号： G06F12/00
CPC分类号： G06F3/0643 , G06F3/0619 , G06F3/0689 , G06F11/1076
摘要： Methods, systems, and computer program products for preserving atomic writes to disk arrays are disclosed. According to one method, portions of a file are stored in paired locations on a disk array such that a first location of a location pair for a file portion stores scratch data for the file portion and a second portion of the location pair for the file portion stores valid data for the file portion. A bitmap is stored on the disk array. The bitmap has bits indicating whether valid data for each file portion resides in the first or the second location for its respective location pair. A write request to write data to a portion of the file being less than the entire file is received. The bitmap indicates that valid data for the portion of the file to be written to resides in a first memory location of one of the location pairs on the disk array. In response to the write request, the bitmap is copied to memory, the data for the portion of the file requested to be modified is copied from the first location of the one location pair to a second location of the one location pair on the disk array without copying the entire file and modifying the data in the second location based on the data to be written. The bitmap stored in memory is modified to indicate that valid data for the portion of the file resides in the second location of the one location pair and that scratch data for the portion of the file resides in the first location on the disk array. A request to save the modification is received, and, in response to the request to save the modified data, the bitmap stored on the disk array is replaced with the modified bitmap.
摘要翻译：公开了用于保留对磁盘阵列的原子写入的方法，系统和计算机程序产品。根据一种方法，文件的部分被存储在磁盘阵列上的配对位置中，使得用于文件部分的位置对的第一位置存储用于文件部分的暂存数据和用于文件部分的位置对的第二部分存储文件部分的有效数据。位图存储在磁盘阵列上。位图具有指示每个文件部分的有效数据是否位于其相应位置对的第一或第二位置的位。接收写入数据到文件部分小于整个文件的写入请求。位图指示要写入的文件部分的有效数据位于磁盘阵列上的一个位置对的第一个内存位置。响应于写入请求，将位图复制到存储器中，将要修改的文件部分的数据从一个位置对的第一位置复制到磁盘阵列上的一个位置对的第二位置而不复制整个文件，并根据要写入的数据修改第二个位置的数据。存储在存储器中的位图被修改以指示文件部分的有效数据驻留在一个位置对的第二位置，并且该部分文件的暂存数据驻留在磁盘阵列上的第一个位置。接收到保存修改的请求，并且响应于保存修改的数据的请求，存储在磁盘阵列上的位图被替换为修改的位图。

2. 发明授权

US08452816B1 Managing database access 有权
标题翻译：管理数据库访问
公开(公告)号：US08452816B1
公开(公告)日：2013-05-28
申请号：US12750919
申请日：2010-03-31
申请人： Robert F. Goudreau, Jr. , Saurbh M Pathak , Miles A. DeForest , David Haase , Jackson Brandon Myers , Sriram Nagasubramanian , Michael P. Wagner
发明人： Robert F. Goudreau, Jr. , Saurbh M Pathak , Miles A. DeForest , David Haase , Jackson Brandon Myers , Sriram Nagasubramanian , Michael P. Wagner
IPC分类号： G06F17/30
CPC分类号： G06F17/30289
摘要： A method is used in managing database access. A framework is provided for translating versioned data between memory and persistent storage. Based on the framework, read and write requests that access records in a database are translated. Based on the framework, it is made to appear that the database is a different version of the database.
摘要翻译：一种方法用于管理数据库访问。提供了一种用于在内存和持久存储之间翻译版本化数据的框架。基于框架，读取和写入访问数据库中记录的请求将被翻译。基于该框架，可以看出数据库是数据库的不同版本。

3. 发明授权

US08296530B1 Methods, systems, and computer readable media for optimizing the number of client write requests to virtually provisioned logical units of a physical data storage array 有权
标题翻译：方法，系统和计算机可读介质，用于优化对物理数据存储阵列的虚拟供应的逻辑单元的客户机写入请求的数量
公开(公告)号：US08296530B1
公开(公告)日：2012-10-23
申请号：US12165032
申请日：2008-06-30
申请人： Dipak Prasad , Sriram Nagasubramanian , Carson Jeffrey Barker , David W. Harvey , Miles de Forest , Charles Christopher Bailey
发明人： Dipak Prasad , Sriram Nagasubramanian , Carson Jeffrey Barker , David W. Harvey , Miles de Forest , Charles Christopher Bailey
IPC分类号： G06F12/00
CPC分类号： G06F3/0605 , G06F3/0665 , G06F3/0689
摘要： According to one aspect, the subject matter described herein includes a method for optimizing the number of data writes to virtually provisioned logical units of a physical data storage array. The method is performed at a virtual provisioning layer associated with a physical storage array and includes receiving, from a client, a first write request for writing data to a first portion of a first data block of a virtually provisioned logical unit (VLUN) of the physical data storage array, wherein the size of the first portion is less than the size of the first data block. In response to receiving the first write request, a combined write request is generated from the virtual provisioning layer, where the combined write request is for writing the first portion of the data from the received write request and a second portion of fill data such that a size of the first portion and the second portion is equal to a size of the first data block. The second write request is then forwarded to the physical layer associated with the data storage array.
摘要翻译：根据一个方面，本文描述的主题包括用于优化对物理数据存储阵列的虚拟供应的逻辑单元的数据写入数量的方法。该方法在与物理存储阵列相关联的虚拟供应层处执行，并且包括从客户端接收用于将数据写入到虚拟供应逻辑单元（VLUN）的第一数据块的第一部分的第一写入请求物理数据存储阵列，其中第一部分的大小小于第一数据块的大小。响应于接收到第一写请求，从虚拟供应层生成组合写请求，其中组合写请求用于从接收的写请求写入数据的第一部分，以及填充数据的第二部分，第一部分和第二部分的大小等于第一数据块的大小。然后将第二写入请求转发到与数据存储阵列相关联的物理层。

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