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Date:      Tue, 23 Aug 2005 19:09:00 +0100
From:      Alex Zbyslaw <xfb52@dial.pipex.com>
To:        freebsd-database@freebsd.org
Cc:        jmc <jcagle@gmail.com>, freebsd-hardware@freebsd.org
Subject:   Re: FreeBSD hardware solution for a database server
Message-ID:  <430B663C.2040705@dial.pipex.com>
In-Reply-To: <20050823145159.GB65857@elvis.mu.org>
References:  <040f01c5a4b9$f5d2dff0$0700a8c0@uzi>	<6863f0c905081906061290c642@mail.gmail.com>	<43088442.7000704@bmby.com> <20050823011954.GM17203@decibel.org>	<430AD329.4090601@bmby.com> <20050823144129.GE43820@decibel.org> <20050823145159.GB65857@elvis.mu.org>

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David Drum wrote:

>Quoth Jim C. Nasby:
>
>  
>
>>I'd suggest whichever one is a stripe of mirrors (you don't want a
>>mirror of 2 stripe sets).
>>    
>>
>
>RAID 1+0 (also incorrectly referred to as "10") is a stripe of mirrors.
>RAID 0+1 is a mirror of stripes.
>Jim is right; the difference is subtle yet important when one or more disks fail.
>  
>
This site has a good explanation: 
http://www.pcguide.com/ref/hdd/perf/raid/levels/
Presumably something like RAID 50 would be an improvement too.

--Alex




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