AHCI Issues with WDC Black drives and GEOM_MIRROR

[Jan Bramkamp]

Enabling this knob exposes an older interface to the OS over PCI. It was 
required to install Windows XP without workarounds, because Windows XP 
lacked AHCI drivers on the install disks.

On 27/01/2017 06:05, Octavian Hornoiu wrote:
> Thank Andriy,
>
> it appears my motherboard had a "IDE/SATA" compatibility mode which was
> enabled by default and i had no idea what the option meant but once i
> turned it off everything is showing up as AHCI.
>
> Thanks for your suggestion!
>
>
> Octavian
>
> On Thu, Jan 26, 2017 at 12:46 AM, Andriy Gapon <avg at freebsd.org> wrote:
>
>> On 26/01/2017 00:59, Octavian Hornoiu wrote:
>>> OS: 10.3-RELEASE-p12
>>> Motherboard: ASRock FM2A85X Extreme6 FM2 AMD A85X (Hudson D4) SATA 6Gb/s
>>> USB 3.0 HDMI ATX AMD Motherboard
>>> Memory: 16 GB RAM
>>> 6 Drives: 6x 1TB WD1001FALS (Caviar BLACK)
>>>
>>> I am having a strange issue where I have 6 drives attached to my
>>> motherboard and 4 of them are coming up as SATA 2.x and the others are
>>> coming up in a strange downgraded mode.  The first 4 disks are always
>> shown
>>> as being normal and ada4/5 always have the strange configuration.  I know
>>> the motherboard chipset is good and supports 7 drives of SATA 2/3 in any
>>> combination so I'm perplexed as to what the issue is.
>>>
>>> Why are drives 4 and 5 listed as being on bus ata0 and ata1 instead of
>>> ahcich4 and 5?
>>
>> Check your BIOS settings.  Sometimes they have a separate IDE/AHCI knob
>> for the
>> last two channels.
>>
>>
>> --
>> Andriy Gapon
>>
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