From owner-freebsd-hardware@FreeBSD.ORG  Mon Feb 26 09:11:45 2007
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From: Adriaan de Groot <groot@kde.org>
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To: freebsd-hardware@freebsd.org
Date: Mon, 26 Feb 2007 11:10:29 +0100
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Cc: MeX <mex@active.sk>
Subject: Re: Hardware supported?
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On Monday 26 February 2007 08:37, MeX wrote:
> On Mon, 2007-Feb-26 at 00:56:59 +0100, Fluffles wrote:
> > Onboard RAID does not really exist. The actual RAID is done by drivers;
> > onboard RAID is actually software RAID with a minor RAID BIOS which can
> > write metainformation about the array configuration and has BIOS
>
> What does mean that ataraid driver can NOT write metadata format? I use
> NVIDIA MediaShield on SUN X2100 M2 and it seems that all works:

ata(4) and ataraid(4) will answer that; FreeBSD can not write the nVidia 
*meta*data to create or modify RAID sets with that kind of fake raid (nor 
does it support the "RAID 5" level in nv fakeraid). 

> ad4: 152627MB <Seagate ST3160827AS 3.42> at ata2-master SATA150
> ad6: 152627MB <Seagate ST3160827AS 3.42> at ata3-master SATA150
> ar0: 152627MB <nVidia MediaShield RAID1> status: READY
> ar0: disk0 READY (master) using ad6 at ata3-master
> ar0: disk1 READY (mirror) using ad4 at ata2-master

That's fine; it reads the *meta*data and then handles the fakeraid setup 
normally. But to add an extra disk to the array you will have to go through 
the BIOS.


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