Re: Hardware vs. Software Raid Speed

[Marc Perkel]

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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