tape library and a stand-alone tape

[Dan Langille]

I'm trying to add a tape library to an existing system.  And I've run 
into a problem.  I think it is related to having two tape drives in the 
same system, but I'm not sure.  I *think* the problem is device 
numbering.  e.g. sa0 versus sa1.

What should I be reading to tie a given physical SCSI device to a 
particular /dev/ entry?

If you're curious: http://www.freebsddiary.org/tape-library.php

Thank you.