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    • 5. 发明授权
    • Method of and apparatus for compressing and decompressing data and data
processing apparatus and network system using the same
    • 用于压缩和解压缩数据和数据处理装置的方法和装置以及使用其的网络系统
    • US5872530A
    • 1999-02-16
    • US790063
    • 1997-01-28
    • Seiichi DomyoHiroshi YoshiuraYoshiaki HattoriYutaka OtsuHiromasa Murakami
    • Seiichi DomyoHiroshi YoshiuraYoshiaki HattoriYutaka OtsuHiromasa Murakami
    • H03M7/40G06F5/00H03M7/30H03M7/00
    • H03M7/3088
    • In a data compression method using dictionaries, there are adopted a dynamic dictionary and a static dictionary to prevent the deterioration in the data compression ratio in the leading portion of the input data which cannot be efficiently compressed using the dynamic dictionary. Moreover, the configuration removes the disadvantage of the deterioration in the data compression ratio because character strings having a low appearance frequency occupy a large portion of the dictionary. Data to be compressed is inputted via an input unit to be decomposed into input bit strings 202. Using the input bit string as a retrieval key, a bit string retrieval is conducted through the static dictionary by a decision unit and a reference unit. According to a result from comparison between the input bit string and a bit string of the static dictionary and a result from the retrieval by a retrieving unit through the dynamic dictionary, whether or not the input bit string is to be registered to the dynamic dictionary is determined. For registration of the input bit string, an index is added thereto by a register unit before the registration. The input bit string or an index matching the string is outputted as compressed data.
    • 在使用字典的数据压缩方法中,采用动态字典和静态字典,以防止使用动态字典无法有效压缩的输入数据的前导部分中的数据压缩比的恶化。 此外,由于具有低出现频率的字符串占据了字典的大部分,因此该配置消除了数据压缩率恶化的缺点。 要被压缩的数据经由输入单元输入以被分解为输入位串202.使用输入位串作为检索关键字,通过决定单元和参考单元通过静态字典进行位串检索。 根据输入比特串与静态词典的比特串之间的比较结果,以及通过动态词典由检索单元检索的结果,输入比特串是否要注册到动态词典是 决心。 为了注册输入位串,在注册之前,通过寄存器单元向其添加索引。 输入位串或匹配字符串的索引作为压缩数据输出。
    • 6. 发明授权
    • Distributed file system permitting each user to enhance cache hit ratio
in file access mode
    • 分布式文件系统允许每个用户在文件访问模式下提高缓存命中率
    • US5559984A
    • 1996-09-24
    • US313844
    • 1994-09-28
    • Hirohiko NakanoSeiichi DomyoTakaki KurodaNaofumi ShoujiAtsushi Kobayashi
    • Hirohiko NakanoSeiichi DomyoTakaki KurodaNaofumi ShoujiAtsushi Kobayashi
    • G06F12/00G06F12/08G06F12/12G06F13/00G06F12/02G06F15/177
    • G06F12/122G06F12/0866Y10S707/99932
    • A distributed file system in which the cache hit ratio of a client is enhanced to speed up a file access for each of users logging into the client. A file server includes an access frequency database in which the names of users are listed in association with the names of files that are frequently accessed by the individual users. Each client includes a log-in user table for entering the name of a user who is logging in, and a cache priority control module. The cache priority control module sets priority levels for the copies of the files stored in a cache area, on the basis of the contents of the access frequency database and the log-in user table. The set priority levels function as criteria when any of the file copies is to be expelled from the cache area. Owing to this construction, the copies of the files of high usage frequencies are preferentially kept in the cache area of the client for each user logging into this client, whereby the cache hit ratio can be enhanced to speed up the file access.
    • 分发文件系统,其中客户端的高速缓存命中率被增强以加速登录到客户端的每个用户的文件访问。 文件服务器包括访问频率数据库,其中列出与用户个体经常访问的文件的名称相关联的用户名。 每个客户端包括用于输入正在登录的用户的名称的登录用户表和缓存优先级控制模块。 高速缓存优先级控制模块基于访问频率数据库和登录用户表的内容来设置存储在高速缓存区域中的文件的副本的优先级。 当任何文件副本将从高速缓存区域中排出时,设置的优先级级别将用作标准。 由于这种结构,对于登录到该客户端的每个用户,优先将高使用频率的文件的副本保存在客户端的高速缓存区域中,由此可以增强高速缓存命中率以加速文件访问。
    • 10. 发明申请
    • STORAGE APPARATUS AND ADDITIONAL DATA WRITING METHOD
    • 存储设备和附加数据写入方法
    • US20130046944A1
    • 2013-02-21
    • US13257677
    • 2011-08-19
    • Seiichi DomyoTaketoshi SakurabaHidehisa Arikawa
    • Seiichi DomyoTaketoshi SakurabaHidehisa Arikawa
    • G06F12/16
    • G06F11/1453
    • Deduplicated backup data of a plurality of generations are aggregated and stored.A storage apparatus is connected via a network to a host system making a content write request and includes a storage unit providing one or more containers composed of a specified storage area, and a back up unit storing the content in the container in accordance with a backup request from the host system; and wherein the backup unit cuts out the content into one or more chunks, detects a duplicate chunk, which is a duplicate of a chunk stored in the container, from the cutout chunks, and additionally writes the chunk, other than the duplicate chunk, to the container where the duplicate chunk is stored.
    • 聚合并存储多代的重复数据删除的备份数据。 存储装置经由网络连接到进行内容写入请求的主机系统,并且包括提供由指定存储区域组成的一个或多个容器的存储单元和根据备份存储该容器中的内容的备份单元 主机系统请求; 并且其中所述备份单元将所述内容切割成一个或多个块,从所述切出块检测重叠的与所述容器中存储的块的重复块,并且将所述块除了所述重复块之外还将所述块 存储重复块的容器。