当使用外部实用工具完成复制数据块之后，在执行onmode - c unblock时，RSS服务器将开始应用暂存的逻辑日志中的日志记录。
After completion of copying chunks using external utility, when onmode -c unblock is executed, the RSS server will start applying log records from the logical logs that were staged.
象reiserfs一样，XFS使用逻辑日志；即，它不象ext3那样将文字文件系统块记录到日志，而是使用一种高效的磁盘格式来记录元数据的变动。
Like ReiserFS, XFS USES a logical journal; that is, it does not journal literal filesystem blocks like ext3, and instead USES an efficient on-disk format to log metadata changes.
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