listing drives attached to a particular controller

[Gaston, Jason D]

How would you go about listing the hard drives attached to a particular
controller?  For example, say you have a SCSI controller card w/ drives
and an onboard SATA RAID controller in your system.  In the future,
dmraid will have the ability to create a RAID array from the command
line.  You may want to only add drives to the array that are attached to
the same controller.  Otherwise, when the system boots, the RAID option
ROM may display the RAID array as broken, as it will only see the drives
attached to the single controller.

Should this functionally be added to the dmraid utility?  Should dmraid
block or warn about using block devices that are attached to different
controllers?

Thanks,

Jason