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On Mon, 1 Jul 2002, R. Bruce Hoffman, Jr. wrote:

> > > Reads are about the same... the real performance boost on mirroring
> comes
> > > from writes.
> >
> > I believe this is incorrect.  On a mirrored set the write command must be
> > completed twice, whereas a single read operation on either side of the
> > mirrored pair will fulfill a read request.  Thus reads should be faster
> > and writes much slower.
>
> The raid set waits on multiple arms to complete a write. Mirrored sets wait
> on one arm to complete the write. If you want to argue this, talk to Larry
> Youngren.

It looks like we talking about different things.  I was trying to say that
writes on a mirrored set are slower as compared to writes on no raid at
all.  I agree that writes are faster on raid level five or higher (which
is what I think you are referring to).  Sorry about the confusion.

James Rich



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