I searched the archives and found a thread from over a year ago talking
about adding support to dd for O_DIRECT, but it is not documented in the
man pages. Did the man pages not get updated, or did this patch not
make it in?
If O_DIRECT is supported, but not documented, then I wonder: does dd use
aio so as to keep the IO pipelined, since a blocking read/write would
only be able to access one file/disk at a time?
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