ext4, application expectations and power management
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There's been a certain amount of discussion about behavioural differences between ext3 and ext4[1], most notably due to ext4's increased window of opportunity for files to end up empty due to both a longer commit window and delayed allocation of blocks in order to obtain a more pleasing on-disk layout. The applications that failed hardest were doing open("foo", O_TRUNC), write(), close() and then being surprised when they got zero length files back after a crash.
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