At times, to meet performance requirements, you would want to disable file system journaling. Given below are steps to do so for an ext4 file system (e.g. /dev/sda1). These steps have been tested on RHEL 5.7). All commands are to be executed with root privileges:

STEP 1: Unmount the file system partition whose journaling you wish to disable

Use the following command to unmount the partition on /dev/sda1 (let’s say it’s /opt):

umount /opt

NOTE: The command used above is umount and not unmount.

STEP 2: Disable journaling for the file system

Use the following command to disable journaling for an ext4 file system:

tune4fs -O ^has_journal /dev/sda1

 

STEP 3: Perform a file system check

Use the following command to perform a file system check. This is not strictly required, but is recommended for checking file system integrity after disabling journaling:

e4fsck –f /dev/sda1

 

STEP 4: Reboot

You may use the following command to reboot the Linux OS:

shutdown –r now

 

STEP 5: Verify that the file system has journaling disabled and the partition is mounted

After the host has rebooted, you may use the following commands to check if journaling is disabled for the filesystem and the partition is mounted:

dmesg | grep EXT4

Expected output similar to: EXT4-fs (dm-3): mounted filesystem without journal 

df -h

 

In order to re-enable journaling, repeat all the STEPS above, but without the ‘^’ in STEP 2.

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