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How Do I Revert from an ext3 to an ext2 File System?

Because ext3 is relatively new, some disk utilities do not yet support it. For example, you may need to shrink a partition with resize2fs, which does not yet support ext3. In this situation, it may be necessary to temporarily revert a file system to ext2.

Reverting from ext3 to ext2

To revert to ext2, just follow these 5 steps:

  1. To revert a partition, you must first unmount the partition by logging in as root and typing:
     
    umount /dev/mapper/VolGroup00-LogVol02
     
  2. Next, change the file system type to ext2 by typing the following command as root:
     
    /sbin/tune2fs -O ^has_journal /dev/mapper/VolGroup00-LogVol02
      
  3. Now, check the partition for errors by typing the following command as root:
     
    /sbin/e2fsck -y /dev/mapper/VolGroup00-LogVol02
     
  4. Then, mount the partition again as an ext2 file system by typing:
     
    mount -t ext2 /dev/mapper/VolGroup00-LogVol02 /mount/point
     
    *Note: In the above command, replace /mount/point with the mount point of the partition.
     
  5. Next, remove the .journal file at the root level of the partition by changing to the directory where it’s mounted and typing:
     
    rm -f .journal 

And there you have it! You now have an ext2 partition. *Note: If you want to permanently change the partition to ext2, remember to update the /etc/fstab file.

 

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