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Linux: data=writeback on root partition
Problem:
If you just change the fstab file, Linux will in effect try to remount the filesystem, but for some reason (bug?), it's not able to remount it with write access, so booting always fails.
 
Solution:
1. Modify the /etc/fstab file. In place of defaults, I put in data=writeback,noatime

2. Use mkinitrd to create a new ramdisk image file

3. Modify grub.conf (or lilo) to point to the new image file

 
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