Linux File Systems - ext4

The ext4 file system is the default file system used by Linux distributions. It provides enhanced features compared to previous versions like ext3.

• Journaling support (journal mount point)
• Large file support (up to 16TB)
• Subtree check (reduces disk space usage)
• Inline journal (improves performance)
• Writeback cache (optimal performance on high-speed storage)
• Durability (data integrity verification)

The ext4 filesystem is typically mounted at /var, /home, and /tmp.

  
mount /dev/sda1 /var -o defaults,noatime  
mount /dev/sdb1 /home -o defaults,noatime  
mount /dev/sdc1 /tmp -o defaults,noatime  
            

To configure ext4, you can modify the mount options using the sysfs or via mount command.

• ls -l /etc/fstab - checks the fstab configuration
• resize2fs /dev/sda1 10G - resizes the filesystem
• checkfs --list /dev/sda1 - checks filesystem integrity

ext4 is a robust and modern file system that offers extensive features and compatibility across different Linux distributions.

• Ext3
• XFS
• mkfs