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ouch... i'm conservative when it comes to filesystems; i had to revert from ext4 to ext3 on Amazon's EC2 because ext4 had more trouble with EBS... every other time I've tried a new filesystem i've had trouble with wrecks and data corruption... making a whizzy new filesystem the default will cause a lot of pain

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Hey, I'd really appreciate it if you could send a report of your experiences to linux-ext4@vger.kernel.org. This is the first I've heard of issues with ext4 with EBS, and I'd love to know more. (Also, please mention the kernel version you are using; one possibility is that EC2 kernels tend to lag upstream kernels, and ext4 has had a lot of bug fixes since a RHEL or SLES kernel of 2.6.32/2.6.34 --- upstream is at 2.6.39, and we're about to release version 3.0. :-)

I agree that the change will cause a lot of pain, however early adopters tend to have a high tolerance for pain. If you don't want to deal with the pain or are running a server (your EC2 mention sounds like a server), you probably want to avoid cutting edge distros like Fedora.

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