The collected works of briauc

I have a Quantum VS160 tape drive which operates but only very slowly. I believe this is because the /var/sysgen/master.d/scsi file is not configured for this drive type.
I am operating this as an external drive on an Origin 200 + Irix 6.5.20
Does anyone have configuration file details that will enable support of this drive type and what else, if anything, is needed to get this working at it's optimum speed