Date: Fri, 09 Feb 2007 20:52:17 -0500 From: Mike Andrews <mandrews@bit0.com> To: freebsd-stable@freebsd.org Subject: Re: What is a good choice of sata-ii raid controller for freebsd? Message-ID: <45CD2551.2070206@bit0.com> In-Reply-To: <200702091441.39848.josh@tcbug.org> References: <00ad01c74b65$79db1710$0c00a8c0@Artem> <45CC72D4.9040104@lxnt.info> <01e601c74c5d$31be19c0$0c00a8c0@Artem> <200702091441.39848.josh@tcbug.org>
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Josh Paetzel wrote: > What hardware RAID buys you over gmirror is that you can boot from it. [snip] > 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@bit0.com * http://www.bit0.com It's not news, it's Fark.com. Carpe cavy!
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