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On Thu, 09 Feb 2006 15:14:20 +0100, Fabrizio Magni wrote:
> The second dd has its I/O merged.
>
> Consider this controversial but the I/O scheduler eliminate the need to
> have oracle block size "aligned" to file system block size (even without
> direct I/O).
>
> Regards
How exactly did you test? Did you use elvtune (RH3) or did you put an appropriate scheduler in grub.conf (RH4)? This is a very special case of a sequential I/O which doesn't tell you much. Usually, I/O patterns resulting from the database use are a bit different.
-- http://www.mgogala.comReceived on Fri Feb 10 2006 - 06:45:16 CST