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Re: O_DIRECT support in dd

From: Phillip Susi
Subject: Re: O_DIRECT support in dd
Date: Fri, 18 Nov 2005 11:04:40 -0500
User-agent: Thunderbird 1.5 (Windows/20051025)

The man pages at:


Do not document an iflag parameter. Is this simply an error in the documentation? It looks like I'm still using coreutils 5.2, so I guess I'll have to upgrade. I'm wondering now why there was over a year between the release of 5.2.1 and 5.92, with nothing in between.

Paul Eggert wrote:
Phillip Susi <address@hidden> writes:

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.

It's in coreutils 5.93 dd.  Try, e.g., "dd iflag=direct".  It's
not documented with the phrase "O_DIRECT", though, which is possibly
why you missed it.

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?

Nope.  Might be nice to add, I suppose.

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