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Thread: Ext4 data loss

  1. #1
    Join Date
    Dec 2006
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    Romania
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    Kubuntu Jaunty Jackalope (testing)

    Exclamation Ext4 data loss

    I recently installed Kubuntu Jaunty on a new drive, using Ext4 for all my data.

    The first time i had this problem was a few days ago when after a power loss ktimetracker's config file was replaced by a 0 byte version . No idea if anything else was affected.. I just noticed ktimetracker right away.

    Today, I was experimenting with some BIOS settings that made the system crash right after loading the desktop. After a clean reboot pretty much any file written to by any application was 0 bytes.
    For example Plasma and some of the KDE core config files were reset. Also some of my MySQL databases were killed...

    My EXT4 partitions all use the default settings with no performance tweaks. Barriers on, extents on, ordered data mode..

    I used Ext3 for 2 years and I never had any problems after power losses or system crashes.

    Did anyone else have a similar experience?
    Thanks

    Update: Anyone experiencing this issue please comment on Bug #317781

    Also note that some recent Seagate drives have some firmware issues that are not related to ext4 in any way. Look here and here for more info.
    Last edited by gribelu; January 22nd, 2009 at 09:43 AM.

  2. #2
    Join Date
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    Ubuntu 10.10 Maverick Meerkat

    Re: Ext4 data loss

    perhaps you should put up a bug-report about this on launchpas.
    Registered Linux user #468829

    http://flossexperiences.wordpress.com

  3. #3
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    Kubuntu Jaunty Jackalope (testing)

    Re: Ext4 data loss

    First I wanted to see if my experience is unique or not and maybe gather more info before I post a bug.

  4. #4
    Join Date
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    Ubuntu Development Release

    Re: Ext4 data loss

    Regardless of uniqueness or not this needs to be filed now so it can be investigated.
    On strike during the Oneiric cycle due to ungratefulness of Ubuntu.


  5. #5
    Join Date
    Jul 2006
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    Ubuntu 9.04 Jaunty Jackalope

    Re: Ext4 data loss

    I guess yout already know, but for any chance of recovering the data, be sure not to mount the affected partitions -- leave them unmounted until you can run a suitable recovery tool (if any exist for ext4 yet) or get an ext4-expert to look at it.

  6. #6
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    Kubuntu Jaunty Jackalope (testing)

    Re: Ext4 data loss

    Jhongy - Sane advice. Unfortunately i noticed the data loss the first time i booted after the crash so everything was already mounted

  7. #7
    Join Date
    May 2007
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    64

    Re: Ext4 data loss

    hey,

    just last night i was experiencing some kernel panics, and after rebooting i noticed that about half of the settings in firefox and the extensions had been reset to default. i didn't even consider data loss until i read this thread.

    my home partition is ext3 mounted as ext4 with the relatime option.

    unfortunately, i won't be able help with bug filing until way later today, i just wanted to let you know that i might be experiencing the same problem.

  8. #8
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    Kubuntu Jaunty Jackalope (testing)

    Re: Ext4 data loss


  9. #9
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    Jul 2006
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    West Midlands, UK
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    Re: Ext4 data loss

    Just thought I'd add to this. I recently upgraded to ext4 as well, I ran a game in Wine and the system hardlocked. After rebooting all my Wine registry files were 0 bytes, as were many of my Gnome configuration files. Absoloute nightmare.
    Wine FAQ and Newbie Guide - http://wiki.winehq.org/FAQ
    Please read This Page on how to install Wine.

    RetroTracks.net - Classic Game Music Tracks

  10. #10
    Join Date
    Nov 2006
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    Sweden
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    Ubuntu Development Release

    Re: Ext4 data loss

    Well, I have 2 partitions somewhere on a disk....

    Both Ubuntu and Windows including "pro disk tools" can only see
    30GB of 120GB....

    Maybe time for a low-format tool... Killdisk maybe or Seagates tool.


    I also blow up my BIOS in a second Flash.... impossible to
    load AMIs rom-file for recovery...

    And a infraction....

    Good night....

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