Spades spades at
Sun Feb 20 02:35:39 GMT 2005

How do we check if FreeBSD recorgnises it as individual drives or Hardware 
RAID array.

----- Original Message ----- 
From: "Chad Leigh -- Shire.Net LLC" <chad at>
To: "Sandy Rutherford" <sandy at>
Cc: <freebsd-questions at>; "Spades" <spades at>
Sent: Saturday, February 19, 2005 5:46 PM
Subject: Re: raid1

On Feb 19, 2005, at 12:37 AM, Sandy Rutherford wrote:

>>>>>> On Fri, 18 Feb 2005 23:51:53 -0700,
>>>>>> "Chad Leigh -- Shire.Net LLC" <chad at> said:
>> On Feb 18, 2005, at 11:39 PM, Spades wrote:
>>> hi, my server hardware supports hardware raid, i installed it
>>> as per normal freebsd 5.3, however i see no difference
>>> in df. its using 2 x 160GB, what do i do during the installation
>>> to enable the raid?
>>> mobo:
>>> EG.cfm
>>> -bash-2.05b$ df
>>> Filesystem  1K-blocks   Used    Avail Capacity  Mounted on
>>> /dev/ad4s1a  66008394  35424 60692300     0%    /
>>> devfs               1      1        0   100%    /dev
>>> ...
>> What do you expect to see?
>> A raid1 is a mirror set and to the OS would probably look like a single
>> drive if it truly is a HW raid
> This should be true of any hardware RAID level, not just RAID1.  The
> HW RAID presents logical drives to the OS, which look like real drives
> to it.  The caveat is that the RAID driver will appear as the disk
> type.  I don't have any experience with SATA RAID, but on my server,
> which has a Mylex ExtremeRAID 1100 SCSI RAID card, a df gives:
> Filesystem              1K-blocks    Used   Avail Capacity  Mounted on
> /dev/mlxd0s1a           ...
> /dev/mlxd0s1d           ...
> /dev/mlxd0s1h           ...
> /dev/mlxd0s1e           ...
> /dev/mlxd0s1f           ...
> /dev/mlxd0s1g           ...
> /dev/mlxd1s1e           ...
> /dev/mlxd1s1f           ...
> /dev/mlxd1s1g           ...
> /dev/mlxd2s1e           ...
> mlx(4) is the driver for this card.  The underlying hard drive
> structure doesn't look anything like the above, but this is irrelevant
> to the OS.
> Regarding your situation, I believe that your MB uses an Adaptec SATA
> controller.  You should find out exactly what the controller is and if
> it is supported in "Hardware Notes".  I would expect that if your
> controller is supported and found, then "ad" should be replaced by the
> relevant driver.  Also, have a look at the dmesg output.  There should
> be some sign that the OS is recognizing your RAID controller.

According to the MB specs at the URL given by the OP, the SATA is an
Intel 6300ESB (part of a more general IO chip)

" • 6300ESB (Hance Rapids) SATA Controller (2x Drive support)
• 2x SATA Ports
• RAID 0, 1, JBOD support"

I don't see any specific mention of this in any of the HW notes for
5.3.  I would be interested to see the dmesg output at boot time to see
what the system sees for devices and controllers.  If it is an ATA raid
(pseudo HW RAID) then it would show as arX devices and not adX
according to the handbook.


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