Re: DBWR, Direct I/O and the Devil

On Nov 28, 2007 3:07 PM, Bobak, Mark <Mark.Bobak@xxxxxxxxxxxxxxx> wrote:
> I think you want both direct *and* async I/O configured, if your O/S and 
> filesystem will support it.  In that case (with async i/o) you probably will 
> only need 1 DBWR.

Alright so I should set filesystemio_options=setall rather than
directio?  Are there any other parameters to look at?

Don't I still need to mount the disk with "mincache=direct,convosync=direct"?

> http://www.ixora.com.au/tips/avoid_buffered_io.htm
> http://www.ixora.com.au/tips/use_asynchronous_io.htm

Yep I've been reading this already.

My connotation was that direct I/O the opposite of asynchronous I/O.
I'm seeing now that they are more or less independent states of I/O
covering different aspects of behavior.

-- 
Don Seiler
http://seilerwerks.wordpress.com
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