From owner-freebsd-hackers  Mon Sep 10 11: 4:56 2001
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From: Søren Schmidt <sos@freebsd.dk>
Message-Id: <200109101805.f8AI5GU53003@freebsd.dk>
Subject: Re: HPT370 RAID or Vinum?
In-Reply-To: <8846549.1000141895110.JavaMail.imail@roary.excite.com>
 "from john_wilson100@excite.com at Sep 10, 2001 10:11:28 am"
To: john_wilson100@excite.com
Date: Mon, 10 Sep 2001 20:05:05 +0200 (CEST)
Cc: freebsd-hackers@freebsd.org, sos@freebsd.org
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It seems john_wilson100@excite.com wrote:
> Hi there,
> 
> I am trying to install FreeBSD on a (pseudo-) hardware ATA RAID volume which
> consists of two striped ATA disks connected to a Highpoint HPT370
> controller.    "Pseudo-" because FreeBSD detects the individual disks
> (ad4/ad6) as well as the striped volume (ar0).

Uhm, if a RAID array is foundm you cannot access the individual disks,
the driver does not allow for that.
>
> Highpoint built-in RAID (ar0), or ad4/ad6 striped with Vinum?
> 
> I reckon if the RAID functions are implemented in HPT BIOS (in software),
> I'll be better off with Vinum.

The RAID code is implemented in the ATA driver (ata-raid.c) and tbat 
takes over from the BIOS as soon as we are airborne (the BIOS is only
needed and used for booting).

However, there is no way to rebuild the ATA RAID from FreeBSD (that may
soon change though) you have to use the BIOS for that...

-Søren

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