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From: Jeff Garzik <jeff@garzik.org>
To: Linux Kernel <linux-kernel@vger.kernel.org>,
	Linux RAID Mailing List <linux-raid@vger.kernel.org>,
	marc@perkel.com
Subject: Linux: Why software RAID?
Date: Wed, 23 Aug 2006 23:34:25 -0400	[thread overview]
Message-ID: <44ED1E41.40606@garzik.org> (raw)

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



             reply	other threads:[~2006-08-24  3:34 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-08-24  3:34 Jeff Garzik [this message]
2006-08-24  4:22 ` Linux: Why software RAID? Richard Scobie
2006-08-24  8:19   ` Jeff Garzik
2006-08-24 20:08     ` Richard Scobie
2006-08-24  5:20 ` Chris Friesen
2006-08-24  5:25   ` H. Peter Anvin
2006-08-26 20:55     ` Dan Williams
2006-08-24  5:43   ` Mattias Wadenstein
2006-08-24 13:07 ` Adam Kropelin
2006-08-24 13:20   ` Alan Cox
2006-08-24 13:36     ` Adam Kropelin
2006-08-24 13:42       ` Gordon Henderson
2006-09-04 17:29         ` Bill Davidsen
2006-08-24 14:55       ` Mark Lord
     [not found]     ` <44EDB843.2020608@perkel.com>
2006-08-24 15:21       ` Alan Cox
2006-09-04 17:31         ` Bill Davidsen
2006-09-04 17:31           ` Joel Jaeggli
  -- strict thread matches above, loose matches on Subject: below --
2006-08-26  3:50 linux
2006-08-26 12:18 ` Raz Ben-Jehuda(caro)

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