Eric Sandeen wrote:

> but not yet O_DIRECT, will do.


dd if=/dev/zero oflag=direct of=/mnt/test/foobar bs=1024k count=8192

filefrag -v /mnt/test/foobar  | grep -i extents
File is stored in extents format
/mnt/test/foobar: 67 extents found


http://people.redhat.com/esandeen/seekwatcher/ext4-dd-write-odirect.png

-Eric
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