Messages in this thread | | | Date | Wed, 23 Aug 2006 23:34:25 -0400 | From | Jeff Garzik <> | Subject | Linux: Why software RAID? |
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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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