Path: utzoo!mnetor!uunet!husc6!cfa!wyatt
From: wyatt@cfa.harvard.EDU (Bill Wyatt)
Newsgroups: comp.unix.wizards
Subject: Re: adding a second TMSCP device
Message-ID: <953@cfa.cfa.harvard.EDU>
Date: 27 Mar 88 00:22:36 GMT
Organization: Harvard-Smithsonian Ctr. for Astrophysics
Lines: 31


> Question: How do you add a second TMSCP device?
[Ultrix 2.0 sys]

Well, I solved my own problem, through looking at sources, mainly.
The relevant lines in the correct config file seem to be:

adapter		klesiu0	at uba0
controller	tmscp0	at klesiu0 csr 0174500		vector tmscpintr
tape		tms0	at tmscp0 drive 0
adapter		klesiu1 at uba0
controller	tmscp4  at klesiu1 csr 0160404		vector tmscpintr
tape		tms4	at tmscp4 drive 0

I still don't really understand what the `klesiu?' adapter does, but the
above worked to add the second interface, a TMSCP-emulating controller for
our SCSI Exabyte digital video tape drive. In addition, you make the
`tms4' device (makes minor device nos. 32 and up) and access it.

I'm just starting to see what the performance in an Ultrix environment
is. So far, the raw numbers appear to agree with the Digital Review
article of a few weeks back (very slow positioning, good transfer
rate and total capacity), although tar and dump do not reposition 
a tape as much as VMS BACKUP does, so they're better than with VMS.
-- 

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