EXT2
- Ext2 does not have journal feature.
- Speed of file system(read-write) bit faster then ext3
- Require fsck to recover data after unplanned reboot
- By default there is no Online file system growth.
- mkfs.ext2 or mke2fs Commands to format
EXT3
- The main benefit of ext3 is that it allows journaling.
- Bit slower then ext2 file-system
- Does not require manual fsck (automatic file recovery is done at booting time)
- Online file system growth
- mkfs.ext3 or mke2fs -j commands to format
Ext4
- # Supports huge individual file size and overall file system size.
- # Maximum individual file size can be from 16 GB to 16 TB
- # Overall maximum ext4 file system size is 1 EB (exabyte).
- Directory can contain a maximum of 64,000 subdirectories (as opposed to 32,000 in ext3)
- You can also mount an existing ext3 fs as ext4 fs
- In ext4, you also have the option of turning the journaling feature “off”.
FSCK :
If you want to run a fsck for any file system , please run the below command .
#umount /filesystem ; fsck -y /filesystem ; mount /filesystem ; mount -o remount,rw /filesystem ; exit
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