What is a good choice of sata-ii raid controller for freebsd?

Mike Andrews mandrews at bit0.com
Sat Feb 10 01:54:04 UTC 2007

Josh Paetzel wrote:

> What hardware RAID buys you over gmirror is that you can boot from it.  
> From a raw speed perspective on an unloaded CPU a 3.0ghz processor is 
> probably just as fast or faster than the embedded processor on a RAID 
> card running at a few hundred mhz.  Sure, once you start talking 
> about CPUs at full load there are advantages to off-loading stuff to 
> a dedicated processor.

What hardware RAID buys me over gmirror is that SATA2 NCQ actually works 
on recent hardware RAID cards, and doesn't on gmirror -- at least 
according to the ata(4) manpage on 6.2-RELEASE.  Depending on your 
specific application, that could have a performance impact, no?

Mike Andrews  *  mandrews at bit0.com  *  http://www.bit0.com
It's not news, it's Fark.com.                  Carpe cavy!

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