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61. 发明授权

US6052799A System and method for recovering a directory for a log structured array 失效
标题翻译：用于恢复日志结构化数组的目录的系统和方法
公开(公告)号：US6052799A
公开(公告)日：2000-04-18
申请号：US79913
申请日：1998-05-15
申请人： Juan Li , Dung K. Nguyen , Mien Shih , Hai-Fang yun
发明人： Juan Li , Dung K. Nguyen , Mien Shih , Hai-Fang yun
IPC分类号： G06F11/14 , G06F11/00 , G06F12/00
CPC分类号： G06F11/1451 , G06F11/1435 , G06F11/1469
摘要： In a storage system comprising an array of storage devices including a processor and memory, a plurality of data blocks are organized on the storage devices in segments striped across the storage devices. A main directory stored in memory contains the location on the storage device of each of the current data blocks. A method is provided for recovering a main directory in the event that the main directory becomes damaged. A segment directory having information on the data blocks in the segment is stored as part of the segment on the storage devices. Periodically a checkpoint of the main directory is written to the storage devices. A list is maintained of closed segments written to the storage devices since the checkpoint directory was written to the storage devices. During a main directory recovery procedure, the checkpoint of the main directory is read into memory, and for each segment that is indicated by the closed segments list as having been closed since the checkpoint of the main directory was written to the disk, the information in the corresponding segment directory is used to update the checkpoint directory.
摘要翻译：在包括包括处理器和存储器的存储设备的阵列的存储系统中，多个数据块被组织在存储设备上，跨越存储设备条带化。存储在存储器中的主目录包含每个当前数据块的存储设备上的位置。在主目录被损坏的情况下，提供用于恢复主目录的方法。具有关于段中的数据块的信息的段目录作为段的一部分存储在存储设备上。定期将主目录的检查点写入存储设备。由于将检查点目录写入存储设备，所以保留写入存储设备的封闭段的列表。在主目录恢复过程中，主目录的检查点被读入内存，并且由于主目录的检查点被写入磁盘，由闭合段列表指示的每个段已经被关闭，所以在相应的段目录用于更新检查点目录。

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