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Date:      Fri, 20 Feb 2004 14:27:33 -0500
From:      Charles Swiger <cswiger@mac.com>
To:        mi+mx@aldan.algebra.com
Cc:        performance@FreeBSD.ORG
Subject:   Re: strange performance dip shown by iozone
Message-ID:  <D4B74A4C-63DA-11D8-B35A-003065ABFD92@mac.com>
In-Reply-To: <200402201147.03606@misha-mx.virtual-estates.net>
References:  <200402181729.06202@misha-mx.virtual-estates.net> <20040220072258.GA17579@VARK.homeunix.com> <200402201147.03606@misha-mx.virtual-estates.net>

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On Feb 20, 2004, at 11:47 AM, mi+mx@aldan.algebra.com wrote:
> Also, is the RAID5 writing speed supposed to be _so much_ worse, than
> that of a single disk?

it's normal for RAID-5 write performance to be slower than that of a 
bare drive.  RAID filesystems involve tradeoffs between cost, 
performance, and reliability.  RAID-5 maximizes cost and reliability at 
the expense of performance....

-- 
-Chuck



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