"Beyond that, mounting an ext2/3 filesystem under ext4 allows the system to use a number of performance enhancing techniques - like delayed allocation - which do not exist in the older implementations. In other words, ext4 can replace ext2 and ext3, maintain compatibility, and make things faster at the same time."
Isn't delayed allocation still a rather controversial aspect of ext4? Or has it been decided that all the applications will be rewritten to fsync all the time?
I realize that my information is likely out of date, but I'm sure I'm not the only one sticking with ext3 due to this issue.
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