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Date:      Sat, 10 Mar 2007 00:26:34 +0100
From:      Wilko Bulte <wb@freebie.xs4all.nl>
To:        Ivan Voras <ivoras@fer.hr>
Cc:        freebsd-current@freebsd.org, Matthew Jacob <mj@feral.com>, mjacob@freebsd.org
Subject:   Re: MFC request: QLogic 24xx FibreChannel controller
Message-ID:  <20070309232634.GA7407@freebie.xs4all.nl>
In-Reply-To: <45F1EB35.6020303@fer.hr>
References:  <45F18183.7050405@FreeBSD.org> <45F182F2.10604@fer.hr> <ess83u$j2c$1@sea.gmane.org> <70e8236f0703091240q65d45300u836121454d799c64@mail.gmail.com> <45F1C77C.8010103@fer.hr> <70e8236f0703091413o473db67fr451e3be49c44b025@mail.gmail.com> <20070309142918.V61513@ns1.feral.com> <45F1E27A.7090302@fer.hr> <20070309150157.L61706@ns1.feral.com> <45F1EB35.6020303@fer.hr>

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On Sat, Mar 10, 2007 at 12:18:13AM +0100, Ivan Voras wrote..
> Matthew Jacob wrote:
> > Well, based upon the serial number they aren't the same disk then.
> 
> I have no problems with accepting that, but can you offer some
> explanations for the behaviour:
> 
> >> But they are the same device - if I write something on one of them, I
> >> can read it from the other.

It could be that the RAID box offers you different serial numbers via
different ports on the array.  

I know older DEC arrays presented the same serial# for different presented
LUNs.  Not the effect as what you are seeing, but it can serve as an 
illustration of what might happen with external RAID boxes.

-- 
Wilko Bulte				wilko@FreeBSD.org



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