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Ubuntu Jaunty Jackalope 9.04 will offer support for Ext4. A lot of users will try the new file system, especially since it will offer a huge performance boost. But it looks like that there is a massive downside. I quote from the bug report…

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 (during the previous boot) was 0 bytes. For example Plasma and some of the KDE core config files were reset. Also some of my MySQL databases were killed…

This is not a “Ubuntu-problem”…

I thought it was worth adding this, even though I’m running Gentoo, it seems to be exactly the same issue:

I recently upgraded to ext4 as well, I ran a game in Wine and the system hardlocked (nothing special there with the fglrx drivers). After rebooting all my Wine registry files were 0 bytes, as were many of my Gnome configuration files. Absoloute nightmare. fsck on boot said that it had removed 760+ orphaned inodes.

To sum it up: If a computer with Ext4 partitions crashes it is very likely that there will be loss of data. The problem appears to be huge and there will be kernel patches. But it looks like that applications will have to change the way they store their data too.

Theodore Ts’o – one of the best known kernel hackers – wrote an profound explanation. It looks like Ext4 is good for server system which run safely behind a UPS. But on a desktop or a notebook? I think you should think twice before you format your partitions with ext4…

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