《Operating System Concepts》學習第 52 天，p587-p596 總結，總計 10 頁。

一、技術總結

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 開發的一個日志文件系統(Veritas Technologies)。

3.backup

(1)定義

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)分類

1)full backup

2)incremental backup

二、英語總結(生詞：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 頁)。

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 頁)。

關于英語的注解同步更新匯總到 https://github.com/codists/English-In-CS-Books 倉庫。

三、其它

第 14(File-System Implementation) 章簡評：介紹了文件系統的結構(file, directory), 操作，文件恢復等。

四、參考資料

1. 編程

(1) Abraham Silberschatz，Peter Baer Galvin，Greg Gagne《Operating System Concepts》：https://book.douban.com/subject/30272539/

2. 英語

(1) Etymology Dictionary：https://www.etymonline.com

(2) Cambridge Dictionary：https://dictionary.cambridge.org

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