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Date:      Thu, 30 May 2002 09:02:47 +0930
From:      Greg 'groggy' Lehey <grog@FreeBSD.org>
To:        Scott Long <scott_long@btc.adaptec.com>
Cc:        Scott Long <Scott_Long@adaptec.com>, Doug White <dwhite@resnet.uoregon.edu>, Cy Schubert - CITS Open Systems Group <Cy.Schubert@uumail.gov.bc.ca>, Kirk Strauser <kirk@strauser.com>, freebsd-stable@freebsd.org
Subject:   Re: Hardware RAID vs vinum
Message-ID:  <20020530090247.Y82424@wantadilla.lemis.com>
In-Reply-To: <20020529141141.GC2262@hollin.btc.adaptec.com>
References:  <2C7CBDC6EA58D6119E4A00065B3A24CB04636E@btcexc01.btc.adaptec.com> <20020529134211.L82424@wantadilla.lemis.com> <20020529141141.GC2262@hollin.btc.adaptec.com>

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On Wednesday, 29 May 2002 at  8:11:41 -0600, Scott Long wrote:
> On Wed, May 29, 2002 at 01:42:11PM +0930, Greg 'groggy' Lehey wrote:
>>
>> I'm sure that there are good reasons for small stripe sizes.  I don't
>> believe that efficiency is one of them.  I think your problem is that
>> you're looking at single-request latency.  That's usually not an
>> issue, though it may impact copy performance.  As I said, though,
>> that's not usually where you would use RAID-5.  The real issue is not
>> so much latency as throughput.  I hope I've been able to make it more
>> understandable.
>
> Greg,
>
> It is obvious that I have tread onto religious territory here, 

Not for me.  I've given you some very detailed arguments.  I also have
measurements which back them up.

> and as such there is probably little I can say to convince you of my
> points.

Well, you could start by trying.

> I think that we must then agree to disagree =-)

I'd much rather see some technical arguments from you.

Greg
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