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最新评论
-
dxking100:
远光没有笔式题的说..
最新远光软件笔试题面试题内容(1) -
heming_way:
谢谢,正在复习软件工程考试呢,呵呵
《软件工程》选择题 -
梅玲达:
可以更详细点吗?
Hibernate中Criteria 和DetachedCriteria的作用是什么? -
buptjian:
学习下,试试看,谢谢啊~
Prototype如何实现页面局部定时刷新? -
bubblegum89:
这个。。。和我笔试时候做的 感觉完全不一样
最新远光软件笔试题面试题内容(3)
Q: What’s the difference between Symbolic Link and HardLink?
A: ln –s src dst-file vs. ln src-file dst-file
You need to understand how file is stored on the File System and what I-node is all about?
Each file contains 2 things: file-name and structure that stores the real-data of the file.
Symbolic link is like: Added link to the filename only. It can cross device/logical partition.
Harlink is made at I-node(filesystem) level, it’s confined within the same filesystem(physical device). It’s more like adding a reference count to the original file, when hardlink is deleted, the reference minus one only.
Some people on the internet says this:
HardLink is a pointer to a file, Symbolic Link is an indirect-pointer to a file.
Since symbolic link can point to non-existent file on the disk, Hardlink can not.
Q: How much do you know about journalized file system? Why Journalized File System(JFS)?
A: Large HardDisk Partiion; quick recovery from crashes, high-performance I/O; Terabytes data file
Alternative to ext2 there are: ext3, ReiserFS, XFS, JFS
Advantage of JFS:
1. Simplify restarts (longer fsck means longer down time)
2. reduce fragmentation
3. accelerate I/O
4. obsolete fsck()
In ext2: I-NODE stores all info about a file except data itself, it’s a book-keeping file for a file.
Directory’s I-Node contains: inode numbers of its contents, plus permissions, # of blocks, and etc.
Juornal: simply a list of transactions (modifies meta-data structures: inodes, free lists, directory entries).
Onlye ext3 is backward compatible. tune2fs –j /dev/hdb3
A: ln –s src dst-file vs. ln src-file dst-file
You need to understand how file is stored on the File System and what I-node is all about?
Each file contains 2 things: file-name and structure that stores the real-data of the file.
Symbolic link is like: Added link to the filename only. It can cross device/logical partition.
Harlink is made at I-node(filesystem) level, it’s confined within the same filesystem(physical device). It’s more like adding a reference count to the original file, when hardlink is deleted, the reference minus one only.
Some people on the internet says this:
HardLink is a pointer to a file, Symbolic Link is an indirect-pointer to a file.
Since symbolic link can point to non-existent file on the disk, Hardlink can not.
Q: How much do you know about journalized file system? Why Journalized File System(JFS)?
A: Large HardDisk Partiion; quick recovery from crashes, high-performance I/O; Terabytes data file
Alternative to ext2 there are: ext3, ReiserFS, XFS, JFS
Advantage of JFS:
1. Simplify restarts (longer fsck means longer down time)
2. reduce fragmentation
3. accelerate I/O
4. obsolete fsck()
In ext2: I-NODE stores all info about a file except data itself, it’s a book-keeping file for a file.
Directory’s I-Node contains: inode numbers of its contents, plus permissions, # of blocks, and etc.
Juornal: simply a list of transactions (modifies meta-data structures: inodes, free lists, directory entries).
Onlye ext3 is backward compatible. tune2fs –j /dev/hdb3
发表评论
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Unix面试题(英文 附答案)1-8
2010-08-27 10:45 632101. You install Linux and rebo ... -
程序员经常用到的UNIX命令
2010-08-27 10:45 6231. 简单的文件维护与管理ls, cd, mkdir, rm, ... -
Unix面试题(英文 附答案)1-5
2010-08-27 10:45 58256. Which option can not be spe ... -
Unix面试题(英文 附答案)1-4
2010-08-27 10:45 67941. 我们可以订阅新闻组、加入新闻列表获得最新的Linux资 ... -
Unix面试题(英文 附答案)1-7
2010-08-27 10:45 60086. fork 系统调用能:把当前进程复制一份,产生一个新进 ... -
Unix面试题(英文 附答案)1-6
2010-08-27 10:45 72766. What file would you edit to ... -
Unix面试题(英文 附答案)1-1
2010-08-27 10:45 4711. unix 的 at 命令的功能是A作业调度2. 在Lin ... -
Unix面试题(英文 附答案)1-3
2010-08-27 10:45 43831. /etc/passwd文件中有以 ... -
Unix面试题(英文 附答案)1-2
2010-08-27 10:45 88116. /分区越大约好,因为/越大,Linux启动速度越快。 ... -
一套Unix面试题(带答案)- 2
2010-08-27 10:45 63021. 以下给变量赋值的方 ... -
Unix面试题(英文 附答案)2-4
2010-08-27 10:45 87161,What file contains a listing ... -
一套Unix面试题(带答案)- 3
2010-08-27 10:45 35041. 使用 tar cvz 命令将: ... -
Unix面试题(英文 附答案)2-3
2010-08-27 10:45 51541, What switch is used with th ... -
Unix面试题(英文 附答案)3-1
2010-08-27 10:45 5670、Which of the following can be ... -
Unix面试题(英文 附答案)2-6
2010-08-27 10:45 652101, What lilo.conf parameter w ... -
Unix面试题(英文 附答案)2-5
2010-08-27 10:45 55281, Your system has a default m ... -
Unix面试题(英文 附答案)3-3
2010-08-27 10:45 42041、Only files on the same file ... -
Unix面试题(英文 附答案)3-2
2010-08-27 10:45 53321、If the at.allow file does no ... -
Unix面试题(英文 附答案)3-5
2010-08-27 10:45 64481、What syslog.conf facility re ... -
Unix面试题(英文 附答案)2-2
2010-08-27 10:45 59621, There is a file with the fo ...
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