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

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Message-ID: <44EC9699.3040001@perkel.com>
Date:	Wed, 23 Aug 2006 10:55:37 -0700
From:	Marc Perkel <marc@...kel.com>
To:	Tejun Heo <htejun@...il.com>
CC:	Andre Tomt <andre@...t.net>, linux-kernel@...r.kernel.org
Subject: Re: Hardware vs. Software Raid Speed

Tejun Heo wrote:
> 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.
>

Thanks - I suspected that Raid 0 didn't gain anything in hardware unless 
they provided additional buffering or something but I just thought I'd 
ask in case there was something I was overlooking.
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