linux-kernel - Linux: Why software RAID?

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Message-ID: <44ED1E41.40606@garzik.org>
Date:	Wed, 23 Aug 2006 23:34:25 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux RAID Mailing List <linux-raid@...r.kernel.org>,
	marc@...kel.com
Subject: Linux: Why software RAID?

Mark Perkel wrote:
> Running Linux on an AMD AM2 nVidia chip ser that supports Raid 0
> striping on the motherboard. Just wondering if hardware raid (SATA2) is
> going to be faster that software raid and why? 

First, it sounds like you are confusing motherboard "RAID" with real 
RAID.  There's a FAQ for this sort of thing:

	http://linux-ata.org/faq-sata-raid.html

In particular, your motherboard's Raid 0 striping (a) is not done in 
hardware, and (b) has nothing to do with SATA2.

But anyway, to help answer the question of hardware vs. software RAID, I 
wrote up a page:

	http://linux.yyz.us/why-software-raid.html

Generally, you want software RAID unless your PCI bus (or more rarely, 
your CPU) is getting saturated.  With RAID-0, there is no duplication of 
data, and so, PCI bus and CPU usage should be about the same for 
hardware and software RAID.

	Jeff

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