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From: Alex Zbyslaw <xfb52@dial.pipex.com>
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Cc: jmc <jcagle@gmail.com>, freebsd-hardware@freebsd.org
Subject: Re: FreeBSD hardware solution for a database server
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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