How to restore data on ext3

I met at work, checked online articles, and found that few actually passed, it was really angry. I found the software and performed a practical operation to ensure stable recovery.
Test Environment
[Root @ localhost ~] # Uname-
Linux localhost. localdomain 2.6.18-8. EL5 #1 SMP Fri Jan 26 14:15:21 est 2007 i686 i686 i386 GNU/Linux

Required Libraries
[Root @ localhost ~] # Rpm-Qa | grep e2fsprogs
E2fsprogs-libs-1.39-8.el5
E2fsprogs-1.39-8.el5
E2fsprogs-devel-1.39-8.el5
Partition status
[Root @ localhost ~] # DF-H
Filesystem size used avail use % mounted on
/Dev/mapper/VolGroup00-LogVol00
6.2 GB 1.8g 4.2g 30%/
/Dev/sda1 99 m 11 m 83 m 12%/boot
/Dev/mapper/VolGroup00-LogVol02
1008 M 34 m 924 M 4%/Data
Tmpfs 125 m 0 125 m 0%/dev/SHM
Software required
Http://code.google.com/p/ext3grep/downloads/list
Download Software first
[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
Compile the program and test the program. After all the tasks are completed, start the recovery process.
My directory is/Data Partition. I first formatted the partition. I put a file in the root directory and a file in a subdirectory.
/Dev/mapper/VolGroup00-LogVol02 1008 M 34 m 924 M 4%/Data
Copy Point file past
[Root @ localhost ~] #] # Cp/bin/ls/data/
[Root @ localhost ~] #] # Cp-RF/bin/data/
[Root @ localhost ~] #] # Ls-La/data/
Total 136
Drwxr-XR-x 4 Root 4096 Apr 21.
Drwxr-XR-x 25 Root 4096 Apr 21 ..
Drwxr-XR-x 2 root Root 4096 Apr 21 Bin
Drwx -- 2 root Root 16384 Apr 21 17: 15 lost + found
-Rwxr-XR-x 1 Root 93560 Apr 21 ls
[Root @ localhost ~] #
One sub-directory and one Executable File
Now delete the LS file and zcat under the bin
[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
If the file does not exist, we can restore it.
First, unmount the partition.
[Root @ localhost ~] # Umount/dev/mapper/VolGroup00-LogVol02
[Root @ localhost ~] # DF-H
Filesystem size used avail use % mounted on
/Dev/mapper/VolGroup00-LogVol00
6.2 GB 1.8g 4.2g 30%/
/Dev/sda1 99 m 11 m 83 m 12%/boot
Tmpfs 125 m 0 125 m 0%/dev/SHM
Confirm uninstallation and use ext3grep to restore.
[Root @ localhost ~] # Ext3grep/dev/mapper/VolGroup00-LogVol02-ls-inode 2
Scan partitions will be created here
[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 4096 Apr 21.
Drwxr-X-5 root Root 4096 Apr 21 ..
-Rwxr-XR-x 1 Root 93560 Apr 21 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.
Drwxr-XR-x 3 Root 4096 Apr 21 ..
-Rwxr-XR-x 1 Root 62136 Apr 21 zcat
Check whether all files are restored to the restored_files directory. The size is the same.
References
Http://www.xs4all.nl /~ Carlo17/howto/undelete_ext3.html