Thursday, March 18, 2010

ext4 disable journal

At one high loaded web project I needed a very fast file system. I decided to use Ext4 with disabled journal (As a google:))).

# Create ext4 fs on /dev/sda10 disk
mkfs.ext4 /dev/sda10

# Enable writeback mode. This mode will typically provide the best ext4 performance.
tune2fs -o journal_data_writeback /dev/sda10

# Delete has_journal option
tune2fs -O ^has_journal /dev/sda10

# Required fsck
e2fsck -f /dev/sda10

# Check fs options
dumpe2fs /dev/sda10 |more

For more performance add fstab opions: data=writeback,noatime,nodiratime
i.e:
/dev/sda10 /opt ext4 defaults,data=writeback,noatime,nodiratime 0 0

Tested at non-boot partition ;)
at
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24 comments:

  1. Anonymous08 April, 2010 18:37

    are you really sure that this disables journaling?
    as far i know journal_data_writeback is just another journal mode which creates journal of meta data only,...

    ReplyDelete
  2. Andrey Salnikov16 April, 2010 15:42

    # Delete has_journal option
    tune2fs -O ^has_journal /dev/sda10

    This step disables journal

    ReplyDelete
  3. Jim23 June, 2010 03:31

    Or when creating

    mkfs.ext4 -O ^has_journal /dev/sda10

    ReplyDelete
  4. Anonymous20 August, 2010 13:04

    Would you be able to help with the following issue:
    getting more r/w speed from a flash drive install
    http://www.linuxquestions.org/questions/linux-general-1/getting-more-r-w-speed-from-a-flash-drive-install-827164/

    Thanks in advance
    Iain

    ReplyDelete
  5. Anonymous02 August, 2011 13:31

    Could you explain what the purpose of the journal_data_writeback option is once the journal is disabled with the ^has_journal?

    ReplyDelete
    Replies
    1. Anonymous03 October, 2018 20:08

      it's needed to mount with data=writeback

      Delete
  6. Andrey Salnikov02 August, 2011 13:42

    I don't remember why I wrote this :)

    ReplyDelete
  7. Anonymous08 December, 2011 08:59

    Oh wow thank for this bit of advice, I am now able to use ZFS on Linux with ext4 instead of ext2. The journaling feature of ext3-4 made ZFS snapshots work incorrectly. Now it works woo hoo!.

    ReplyDelete
  8. Anonymous28 December, 2011 11:54

    how to check the journal is enable or disable ?

    ReplyDelete
  9. Andrey Salnikov28 December, 2011 12:41

    dumpe2fs /dev/sda4 |grep 'Filesystem features'
    if has_journal option exist - you have journal

    ReplyDelete
  10. Anonymous02 January, 2012 17:24

    Thanks a lot ..................

    ReplyDelete
  11. Anonymous01 February, 2012 17:13

    I ended up here looking for the right command to remove journaling and thought this thread started some time ago, advice is still very good. My 2c for this are: add "discard" to the mount options in fstab

    /dev/sda10 /opt ext4 defaults,data=writeback,discard,noatime,nodiratime 0 0

    "discard" will enable trimming (see http://sites.google.com/site/lightrush/random-1/howtoconfigureext4toenabletrimforssdsonubuntu)

    Have a good one!

    Marcos Albe

    ReplyDelete
    Replies
    1. Unknown09 August, 2015 02:17

      trimming is for newer ssd only (some older ssd not support trim), and not for traditional hdd.

      Delete
    2. Surfall03 April, 2016 01:02

      The above HowTo has been deprecated by the author.

      Delete
    3. Surfall03 April, 2016 01:02

      The above HowTo has been deprecated by the author.

      Delete
  12. Anonymous18 May, 2012 03:09

    Thanks for posting this. Really helped our BigCouch cluster partitions. Couch is such a IO hog.

    ReplyDelete
  13. Anonymous17 August, 2012 17:00

    In the end of the text, for fstab, "nodiratime" is not necessary, as noatime already includes that option. This can be seen in http://lwn.net/Articles/244941/, http://lwn.net/Articles/245002/, and other texts.

    Roberto

    ReplyDelete
  14. Anonymous09 December, 2012 10:53

    Discard options is default in ext4

    Tejas

    ReplyDelete
  15. J19 October, 2013 02:22

    Adding discard is a terrible choice if your goal is performance. It is also meaningless for non-flash drives. If you have a flash drive, and performance is the goal, schedule a nightly fstrim cron job on the relevant partitions.

    ReplyDelete
  16. Anonymous18 May, 2014 16:28

    noatime already includes nodiratime, You don't need to specify both.
    https://wiki.archlinux.org/index.php/fstab#atime_options

    ReplyDelete
  17. Anonymous04 December, 2016 04:45

    noatime automatically enables nodiratime

    ReplyDelete
  18. Anonymous02 February, 2017 06:58

    superb one. i used this technique for porteus linux.

    ReplyDelete
  19. Фимпус17 March, 2019 08:09

    адениус магазинсемян адениума,

    adenium-obesum бонсай дома.

    ReplyDelete

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