《Operating System Concepts》阅读笔记：p587-p596

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《Operating System Concepts》学习第 52 天，p587-p596 总结，总计 10 页。

一、技术总结

1.Recovery

(1)consistency checking

consistency checking 工具：fsck。

(2)log-structure file system

(3)WAFL file system

2.Veritas

(1)Veritas file system

Both NTFS and the Veritas file system use this method, and it is included in recent versions of UFS on Solaris. Veritas file system(VxFS) 指的是 Veritas Technologies 开发的一个日志文件系统(Veritas Technologies)。

3.backup

(1)定义

In file systems, a copy or copies of the file system or changes to the file system that can be used to restore the file system if it is damaged or destroyed.

(2)分类

1)full backup

2)incremental backup

二、英语总结(生词：2)

1.intervention

(1) intervene: inter-(“between, among”) + venire(“to come”)

vi. intervene literally means “to come between(to step in, mediate or interface in a situation), 干涉”。

(2)intervention

(3)示例

Consistency checking can require human intervention to resolve conflicts, and that is inconvenient if no human is available(《Operating System Concepts》第 587 页)。

2.snapshot

(1)snapshot: snap(“to seize quickly, suddenly”) + shot(“an act of shooting”)

c. snapshot literally means “a quick shot with a gun”。in 1890, it was used to mean “photograph shot with a handheld camera”, and figuratively, snapshot is used of sth captured at a moment in time.

(2)示例

The file system can then remove the old pointers and the old blocks and make them available for reuse. If the old pointers and blocks are kept, a snapshot is created; the snapshot is a view of the file system at a specific point in time (before any updates after that time were applied)(《Operating System Concepts》第 588 页)。

关于英语的注解同步更新汇总到 https://github.com/codists/English-In-CS-Books 仓库。