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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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