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Date:      Sat, 13 Apr 2002 01:57:23 +0100
From:      "Clive" <>
To:        <freebsd-stable@FreeBSD.ORG>
Subject:   RE: Accessing ATA Subdisks after kernel compile
Message-ID:  <000001c1e286$2c1986d0$>
In-Reply-To: <>

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>-----Original Message-----
>From: owner-freebsd-stable@FreeBSD.ORG
>[mailto:owner-freebsd-stable@FreeBSD.ORG] On Behalf Of Doug White
>Sent: Friday, April 12, 2002 9:13 PM
>Cc: freebsd-stable@FreeBSD.ORG
>Subject: Re: Accessing ATA Subdisks after kernel compile
>On Thu, 11 Apr 2002 wrote:
>> Hi,
>> I have just recompiled my kernel (cvsup'ed c. 05:00GMT 9th
>April 2002
>> along with source for buildworld 4.5-STABLE) but am experiencing
>> problems accessing the sub-disks attached to my Promise
>Ultra66 U-DMA
>> IDE PCI Controller*.
>Don't do that. If you want to access them individually,
>unconfigure the RAID.
>> ad0: 27199MB <ST328040A> [55262/16/63] at ata0-master UDMA66
>> ar0: 16603MB <ATA RAID1 array> [2116/255/63] subdisks:
>>   ad6: 16603MB <Maxtor 91731U4> [33735/16/63] at ata3-master UDMA66
>>   ad4: 16603MB <Maxtor 91731U4> [33735/16/63] at ata2-master UDMA66
>Doug White                    |  FreeBSD: The Power to Serve
>     |
>To Unsubscribe: send mail to
>with "unsubscribe freebsd-stable" in the body of the message


I don't want any RAID at all! I never configured it in the first place.
However, I am at a loss as to what to do to get rid of ar0.

There are no references to it in /etc/fstab, all slices/partitions made
using /stand/sysinstall where based on ad4 and ad6 (and ad0) - although
sysinstall presented me with ar0, I left it alone.

I even renamed /dev/ar0 to /dev/ar0.old, but it still booted up with the
dmesg above.

The old March 2002 kernel is happy with ar0 and the dmesg is the same,
but lets me access ad4 and ad6 subdisks as entities in their own right.

It seems as though something (kernel?) is 'assuming' that two identical
drives on the same IDE controller must be forming a mirror -or- the card
is saying 'although I'm not a RAID card, my default state is to mirror
identical drives because my BIOS is almost the same as the FastTrak'! I
don't want that.  I want to use this particular card (Promise Ultra-66)
for what it was intended for - extra IDE channels. There is no
accessible BIOS on the card because it has no RAID function.

I would be grateful if anyone has any suggestions as to how to get rid
of ar0.


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