linux-kernel - Re: Hardware vs. Software Raid Speed

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Message-ID: <44EC94A9.4010903@gmail.com>
Date:	Thu, 24 Aug 2006 02:47:21 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Andre Tomt <andre@...t.net>
CC:	Marc Perkel <marc@...kel.com>, linux-kernel@...r.kernel.org
Subject: Re: Hardware vs. Software Raid Speed

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.

-- 
tejun
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