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Date: Fri, 31 Oct 2008 18:26:10 +0100
From: =?ISO-8859-1?Q?Javier_Mart=EDn_Rueda?= <jmrueda@diatel.upm.es>
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To: Daniel Jameson <DJameson@emerytelcom.com>
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Cc: freebsd-current@freebsd.org
Subject: Re: ZFS  attaching direct access drives as Scsibus#target#drive#
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Daniel Jameson escribió:
> 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?
>   

You can edit /boot/device.hints to associate specific SCSI ids to 
specific da entries. Try something like this:

hint.da.0.at="scbus0"
hint.da.0.target="0"
hint.da.0.unit="0"
And so on...