Re: Having both dbwr_io_slaves and disk_asynch_io set

Ah, good question.

I have access to Solaris, but not the correct version.


On Wed, 8 Dec 2004 12:26:21 -0500, Richard Ji <richard.c.ji@xxxxxxxxx> wrote:
> Jared,
> 
> As far as I understand it.  On Solaris 8 and onward, by default
> Asynch IO is turned on and Oracle will use it by issue a KAIO.  If it's
> raw device or Veritas quick IO, the KAIO will succeed.  Otherwise
> KAIO will fail and an AIO that's simulated by LWP doing pwrite() will
> happen.  That's why there are 258 LWP under the DBWR process.
> 
> Now, I can turn Asynch IO off and use Oracle's dbwr slaves to
> simulate that as well.  But as far as I know, one would only want
> to do that on a platform that doesn't support AIO.  In either case,
> you chose one way or the other.  But on this DB that I saw, both
> are set.  So I am wondering which one will it use?  I don't have
> enough permission on the system to truss the process or anything.
> So I wonder if anyone has seen it before and the implication of
> having both set.
> 
> Best regards
> 
> Richard Ji
> 
> 

-- 
Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist
--
http://www.freelists.org/webpage/oracle-l

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