Setting up a raid disk array

[Daniel Feenberg]

On Sat, 3 Oct 2009, Stephen Adler wrote:

> Guys,
>
> I'm thinking of setting up a raid array and usually I just use the
> software raid tools linux provides. But I'm wondering what the
> advantages would be to use the hardware raid controller. Any preference
> out there between using the software or hardware raid?

I discuss lots of issues at:

   http://www.nber.org/sys-admin/linux-nas-raid.html

If you are going to use Linux software raid, I draw your attention to the 
section headed "Why do drive failures come in pairs" which explains why 
Linux software raid 5 is problematic. Otherwise, we like the software 
raid, especially because it reduces dependence on hardware that may be 
hard to replace, and which doesn't improve performance much anyway.

Daniel Feenberg
NBER

>
> Cheers. Steve.
>
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