ZFS attaching direct access drives as Scsibus#target#drive#

[Brooks Davis]

On Tue, Oct 14, 2008 at 01:56:01PM -0600, Daniel Jameson wrote:
> Hello,
> 
>  
> 
> I'm in the process of building several zfs pools for a backup-server,
> the machine has 2 24 port sata 3 controllers and 48 1TB drives for
> storage.  I've done a little testing and found that building  a pool by
> using the da# device names can be inconsistent.  For example if a device
> is lost from the first controller and the box is re-booted all the da#s
> shuffle up,  which creates problems with adjacent pools, and the
> potential for catastrophic failure. In the Sun documentation zpool
> allows a pool to be built by using S#T#D# (Scsibus Target Drive) syntax,
> when I attempt it in FBSD It returns:" cannot use '/dev/c0t0d0': must be
> a GEOM provider" does anyone know a way to statically map a
> scsibus/target/drive to a specific da# or a fix to allow specific drives
> by target numbers to be added to a zpool?

The Sun documentation is not at all relevent when you get to the
disk attachment bit since we use geom.  You can wire da# allocation
down which should do what you want.  There's some documentation in
sys/conf/NOTES.

-- Brooks
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