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首页> 外文期刊>Performance evaluation review >WOJ: Enabling Write-Once Full-data Journaling in SSDs by Using Weak-Hashing-based Deduplication
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WOJ: Enabling Write-Once Full-data Journaling in SSDs by Using Weak-Hashing-based Deduplication

机译:WOJ:通过使用基于弱哈希的重复数据删除功能在SSD中启用一次写入全数据日志记录

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摘要

Journaling is a commonly used technique to ensure data consistency in file systems, such as ext3 and ext4. With journaling technique, file system updates are first recorded in a journal (in the commit phase) and later applied to their home locations in the file system (in the checkpoint phase). Based on the contents recorded in the journal, file sytem can be either in data or metadata journaling mode. With data journaling mode enabled, all file system (data and metadata) updates are written to the journal before being written to the files later on. In contrast, with metadata journaling mode, only updated metadata are written to and protected by the journal, while data are written directly to their home locations in the files. File system users are usually reluctant to use the data journaling mode as every modification (data and metadata) to the file system is written twice, and instead resort to metadata journaling for its fast speed.
机译:日记记录是确保文件系统(例如ext3和ext4)中数据一致性的一种常用技术。使用日志记录技术,文件系统更新首先记录在日志中(在提交阶段),然后应用于文件系统中的原始位置(在检查点阶段)。根据日志中记录的内容,文件系统可以处于数据或元数据日志记录模式。启用数据日志记录模式后,所有文件系统(数据和元数据)更新都将写入日志,然后再写入文件中。相反,在元数据日志记录模式下,仅将更新的元数据写入日志并受日志保护,而数据则直接写入其在文件中的原始位置。文件系统用户通常不愿使用数据日志记录模式,因为对文件系统的每次修改(数据和元数据)都会被写入两次,而是以其快速的速度求助于元数据日志记录。

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