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1. 发明授权

US5694570A Method and system of buffering data written to direct access storage devices in data processing systems 失效
标题翻译：缓冲写入数据处理系统中直接访问存储设备的数据的方法和系统
公开(公告)号：US5694570A
公开(公告)日：1997-12-02
申请号：US376292
申请日：1995-01-23
申请人： Brent Cameron Beardsley , Susan Kay Candelaria , Joel Harvey Cord , Michael Howard Hartung , Joseph Smith Hyde , John Norbert McCauley, Jr.
发明人： Brent Cameron Beardsley , Susan Kay Candelaria , Joel Harvey Cord , Michael Howard Hartung , Joseph Smith Hyde , John Norbert McCauley, Jr.
IPC分类号： G06F3/06 , G06F12/08 , G06F12/00
CPC分类号： G06F3/0601 , G06F12/0866 , G06F2003/0691
摘要： The invention teaches a system and method for temporarily buffering data written to a storage system by a host computer. The storage system includes direct access storage devices and a cache. The cache is used as the buffer for both caching and noncaching data records before destaging to a direct access storage device. Upon receipt of a channel program from a host computer containing data for records to be updated, the storage controller determines if the records are currently cached. If the records are not cached, a write miss has occurred. Upon a write miss the storage controller checks an attribute transmitted in the channel program to determine if the records have a regular format. Records having a known, regular format are buffered in cache until destaged by a background process.
摘要翻译：本发明教导了一种用于临时缓冲由主计算机写入存储系统的数据的系统和方法。存储系统包括直接访问存储设备和缓存。缓存用作缓存和非缓存数据记录的缓冲区，然后再次转到直接访问存储设备。在从包含要更新的记录的数据的主计算机接收到频道节目时，存储控制器确定记录是否被当前缓存。如果记录未缓存，则发生写入错误。在写入错误时，存储控制器检查在通道程序中发送的属性，以确定记录是否具有常规格式。具有已知的常规格式的记录被缓存在缓存中，直到由后台进程去运行。

2. 发明授权

US5991775A Method and system for dynamic cache allocation between record and track entries 失效
标题翻译：记录和轨道条目之间动态缓存分配的方法和系统
公开(公告)号：US5991775A
公开(公告)日：1999-11-23
申请号：US949669
申请日：1992-09-23
申请人： Brent Cameron Beardsley , Lawrence Carter Blount , Joel Harvey Cord , Michael Howard Hartung , Vernon John Legvold
发明人： Brent Cameron Beardsley , Lawrence Carter Blount , Joel Harvey Cord , Michael Howard Hartung , Vernon John Legvold
IPC分类号： G06F12/08 , G06F12/12 , G06F12/02
CPC分类号： G06F12/0866 , G06F12/123 , G06F12/084 , G06F2212/312 , Y10S707/99956
摘要： A data storage system provides generalized record caching through a control unit adapted to support track caching in the upper level store of a two level memory. Dynamic reallocation of space between each type of caching in the upper store follows operating patterns of host computer systems using the data storage system. A storage controller cache has a plurality of segments. A directory data entry data structure is allocated each segment. Such allocated directory entries are used to identify tracks as cached. A plurality of unallocated directory entries are also provided. As a record is cached in a segment outside of a track slot, an unallocated directory entry is used to identify a virtual track in cache corresponding to the track of the record in the lower level store. Records from one track can thus appear in several segments outside track slots. Tracking of records to locate records least recently used is done globally over all track slots and record caching segments and locally within individual record caching segments. A mechanism is provided for identifying record slots, as they become least recently used, and dropping them from the upper level store in the face of competing demands for the space. A second mechanism identifies least recently used segments for dropping from the upper level store.
摘要翻译：数据存储系统通过适于支持两级存储器的上层存储器中的轨道缓存的控制单元提供广义记录高速缓存。在上层商店中的每种类型的缓存之间的动态重新分配空间遵循使用数据存储系统的主机系统的操作模式。存储控制器高速缓存具有多个段。每个段分配目录数据条目数据结构。这样分配的目录条目用于将轨道标识为缓存。还提供了多个未分配的目录条目。由于记录被缓存在轨道槽外的段中，所以使用未分配的目录条目来标识与低级存储中的记录的轨道相对应的高速缓存中的虚拟轨道。因此，来自一个轨道的记录可以出现在轨道槽外部的若干段中。跟踪记录以定位最近最少使用的记录是在所有轨道插槽上全局完成的，并记录缓存段，并在本地记录缓存段。提供了一种用于识别记录槽的机制，因为它们最近被使用，并且在面对空间的竞争性需求的情况下将其从高级存储中删除。第二种机制识别最近最少使用的段从高级存储中删除。

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