raid1

[Sandy Rutherford]

>>>>> On Fri, 18 Feb 2005 23:51:53 -0700, 
>>>>> "Chad Leigh -- Shire.Net LLC" <chad at shire.net> 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:  
 >> http://www.supermicro.com/products/motherboard/Xeon800/E7320/X6DVL- 
 >> 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.

Sandy