AK Dave wrote:
Make a dd copy of your system partition. Reformat as ext4. Restore the system partition with dd. Maybe that would work, and if it doesn't you still have a dd backup to restore later.
What is so mission critical that you cannot wait a month for Ubuntu Jaunty?
I would have to take issue here Dave. The dd command takes not only the data but also the file system structure. It is a cloning command. So if you copy with the dd and then restore you will have restored the file system as well as the data. A better bet would be the cp command or my preference, rsync. These would copy and restore only data.
For anything mission critical I would strongly recommend you pass on ext4 for a while. Currently the journal in ext4 can be written to before the actual data is committed to disk. This has some definite data loss possibilities on an unexpected power loss or system crash. Actually the current reliability of ext4 in the 2.6.28 kernel is somewhat less than ext3 writeback mode. I might consider ext4 on a laptop or desktop with UPS, where a power failure is very unlikely, but not on a system running on standard commercial power.