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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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