自己找了軟件做了一次實戰操作，基本可以保證穩定恢復。
測試環境
[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.18-8.el5 #1 SMP Fri Jan 26 14:15:21 EST 2007 i686 i686 i386 GNU/Linux
碧軒附註：其實什麼版本的系統無所謂 ！
所需的相關庫
[root@localhost ~]# rpm -qa |grep e2fsprogs
e2fsprogs-libs-1.39-8.el5
e2fsprogs-1.39-8.el5
e2fsprogs-devel-1.39-8.el5
碧軒附註：必須要有e2fsprogs-libs，不然在後面ext3grep的安裝會有問題。
分區情況:
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
6.2G 1.8G 4.2G 30% /
/dev/sda1 99M 11M 83M 12% /boot
/dev/mapper/VolGroup00-LogVol02
1008M 34M 924M 4% /data
tmpfs 125M 0 125M 0% /dev/shm
需要軟件
http://code.google.com/p/ext3grep/downloads/list
先下載軟件
[root@localhost ~]# cd /root/src/
[root@localhost src]# wget http://ext3grep.googlecode.com/files/ext3grep-0.6.0.tar.gz src
[root@localhost src]# ls
ext3grep-0.6.0.tar.gz
[root@localhost src]# tar xfvz ext3grep-0.6.0.tar.gz
[root@localhost ext3grep-0.6.0]# ./configure
[root@localhost ext3grep-0.6.0]# make install
[root@localhost ext3grep-0.6.0]# ext3grep
Running ext3grep version 0.6.0
編譯然後測試可以使用了，一切做好了以後開始我們的恢復過程。
我的目錄是/data分區，我先格式化了分區，我放一個文件在根目錄下和一個子目錄下的文件。
/dev/mapper/VolGroup00-LogVol02 1008M 34M 924M 4% /data
碧軒附註：
其實這裏用什麼分居無所謂，你也可以模擬一個出來：
拷貝點文件過去
[root@localhost ~]# ]# cp /bin/ls /data/
[root@localhost ~]# ]# cp -rf /bin /data/
[root@localhost ~]# ]# ls -la /data/
total 136
drwxr-xr-x 4 root root 4096 Apr 21 17:37 .
drwxr-xr-x 25 root root 4096 Apr 21 17:11 ..
drwxr-xr-x 2 root root 4096 Apr 21 17:37 bin
drwx—— 2 root root 16384 Apr 21 17:15 lost+found
-rwxr-xr-x 1 root root 93560 Apr 21 17:37 ls
[root@localhost ~]#
一個子目錄一個可執行文件
現在刪除ls文件和bin下面的zcat
[root@localhost ~]# rm /data/ls
rm: remove regular file `/data/ls’? y
[root@localhost ~]# rm /data/bin/zcat
rm: remove regular file `/data/bin/zcat’? y
[root@localhost ~]# ls -la /data/ls /data/bin/zcat
ls: /data/ls: No such file or directory
ls: /data/bin/zcat: No such file or directory
文件沒有了然後我們來恢復
首先umount掉分區
[root@localhost ~]# umount /dev/mapper/VolGroup00-LogVol02
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
6.2G 1.8G 4.2G 30% /
/dev/sda1 99M 11M 83M 12% /boot
tmpfs 125M 0 125M 0% /dev/shm
確認卸載，然後使用ext3grep來恢復。
[root@localhost ~]# ext3grep/dev/mapper/VolGroup00-LogVol02 --ls --inode 2
這裏會創建掃描分區
碧軒附註：注意這裏的--inode 2
[root@localhost ~]# ext3grep /dev/mapper/VolGroup00-LogVol02 --ls --inode 2
[root@localhost ~]# ext3grep /dev/mapper/VolGroup00-LogVol02 --restore-file ls
Running ext3grep version 0.6.0
WARNING: I don’t know what EXT3_FEATURE_COMPAT_EXT_ATTR is.
Number of groups: 8
Minimum / maximum journal block: 585 / 8787
Loading journal descriptors… sorting… done
Number of descriptors in journal: 58; min / max sequence numbers: 2 / 5
Loading VolGroup00-LogVol02.ext3grep.stage2… done
Restoring ls
[root@localhost ~]# ext3grep /dev/mapper/VolGroup00-LogVol02 --restore-file bin/ls
Running ext3grep version 0.6.0
WARNING: I don’t know what EXT3_FEATURE_COMPAT_EXT_ATTR is.
Number of groups: 8
Minimum / maximum journal block: 585 / 8787
Loading journal descriptors… sorting… done
Number of descriptors in journal: 58; min / max sequence numbers: 2 / 5
Loading VolGroup00-LogVol02.ext3grep.stage2… done
Restoring bin/ls
[root@localhost ~]# ls -la RESTORED_FILES/
total 124
drwxr-xr-x 3 root root 4096 Apr 21 18:01 .
drwxr-x— 5 root root 4096 Apr 21 17:55 ..
-rwxr-xr-x 1 root root 93560 Apr 21 17:48 ls
[root@localhost ~]# ext3grep /dev/mapper/VolGroup00-LogVol02 --restore-file bin/zcat
Running ext3grep version 0.6.0
WARNING: I don’t know what EXT3_FEATURE_COMPAT_EXT_ATTR is.
Number of groups: 8
Minimum / maximum journal block: 585 / 8787
Loading journal descriptors… sorting… done
Number of descriptors in journal: 58; min / max sequence numbers: 2 / 5
Loading VolGroup00-LogVol02.ext3grep.stage2… done
Restoring bin/zcat
[root@localhost ~]# ls -la RESTORED_FILES/bin/
total 188
drwxr-xr-x 2 root root 4096 Apr 21 18:01 .
drwxr-xr-x 3 root root 4096 Apr 21 18:01 ..
-rwxr-xr-x 1 root root 62136 Apr 21 17:48 zcat
看看都恢復在RESTORED_FILES目錄下，大小也一樣
碧軒附註：這個RESTORED_FILES目錄是執行ext3grep的當前目錄下！
參考資料
http://www.xs4all.nl/~carlo17/howto/undelete_ext3.html
From: http://huaidan.org/archives/1913.html