Re: Hardware vs. Software Raid Speed

From: Tejun Heo
Date: Wed Aug 23 2006 - 13:46:22 EST

Andre Tomt wrote:
Marc 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)

SATA2 has nothing to do with hardware RAID.

is going to be faster that software raid and why?

Beeing a consumer type board (AM2), the "raid on the motherboard" is in 99.999% of the cases just software raid implemented in their Windows drivers, a bootup setup screen plus some BIOS magic to get the OS booting.

And, yeah, they're all software RAID. Also, there isn't much to be gained from making RAID0/1 hardware. The software overhead isn't that big. For RAID5, having XOR done in hardware helps.

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