Ext3 is a journaled file system and it maintains a journal file to prevent occurrence of data corruption due to unexpected power failure. The Ext3 file system is a bit more safe than other file systems because of its testing base and relative simplicity but even it is not completely immune to crashes. It happens some times that while using a Ext3 formatted drive, you might receive errors regarding non availability of journal on the file system. As a solution, you have to reinstall the system. When you face such situation, you have to check whether your backup operations are up to date and you can restore the data.
But in the situation when there is some problems in the backup then only one option is left with you And that is to use Linux recovery utilities.
For example, while attempting to mount your Linux based hard disk, you might come across the error message:
“ext3: no journal on file system”
The system fails to boot and data is inaccessible. Even if you boot the system somehow, you may observe that some of the files and folders are missing from
the system.
There may be many reasons for the error some of them are following:
1) You have not properly updated the kernel in the last update operation.
2) The journal file might have been corrupted.
3) The File system is severely corrupted
Now question arises how to resolve such situation, Below are some of the task you can perform to do that:
1) The system has to be boot up with an installation disc and rescue mode is accessed. The Existing installation is Mounted and Kernel package is properly
installed.
The jouranl file can be created by executing the below command--
" tune2fs -j /dev/yourpartitionid"
If above measure fails, then Fsck command is used to to repair the file.
Now boot the system using an installation disc and the Rescue Mode is accessed. While making the system unmounted, run fsck command for all the hard drive partitions except the swap partition.
If You are still unable to Get access of your data then as a final resort Linux Data Recovery tools are used for successfully recovering the lost data. Linux Recovery applications incorporate highly efficient scanning algorithms to scan the logically crashed media and recover data while maintaining their
integrity.
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