mixing narrow wide scsi tape

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From - Tue Oct 31 05:39:33 2000
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From: "Clayton R. Malaker, M.D." <crmalaker@xta.com>
Organization: Clayton R. Malaker, MD,SC
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Subject: Re: FRI: SCSI problem on SCO OS5 - help! (please :-))
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Date: Mon, 30 Oct 2000 23:27:42 -0600
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Bill Vermillion wrote:
> 
> In article <v14jvs0ph15skk16u57ptrbo87dqg0ptkj@4ax.com>,
> Chris Raper  <cmt.raper@triocomp.co.uk> wrote:
> >On Fri, 27 Oct 2000 08:47:29 -0400, Tony Lawrence
> ><tony@aplawrence.com> wrote:
> 
> >>Yes- with new tapes and with any tape if it hasn't had time to
> >>settle in before the attempt to write-  and most especially with
> >>low end (  did I say low end? I meant junk) Travan drives..
> 
> >Mmm - perhaps I should have given you the hardware specification :-)
> 
> It really would have helped :-)
> 
> >- The tape drive is a Tandberg SLR5 - with a 50-pin socket.
> >- Everything is on the Primary SCSI controller
> >- I think the SLR5 is running on SCSI-2 wiring - but it _may_ be on
> >the Wide line with a simple 50-68 way converter.
> 
> >I am not sure which type of converter it would be - all I know is the
> >ones we have in-house are small, plastic and quite cheap. :-)
> 
> Cheap is NOT good.  There are two schools of thought - based on
> their web pages - on how to intermix wide/narrow.  I prefer the DPT
> method, perhaps because I know them, [well knew before the name changed
> to Adaptec on the building].
> 
> The recommend termination the full width - 68 pins at the far end
> of the cable and place the 50 pin in the middle.  This ensures
> proper termination for the length of the 68.  The other school of
> thought is to terminate the high lines at the last 68 pin device
> and then place all narrow devices past that and terminate the
> remaining line there.  I prefer the narrow in the middle in
> approach - it offends my sense of proper engineering far less than
> the narrow at the ned.
> 
> >>my comments about SCSI were more directed to your lockup problems
> >>which are always cables, termination or junk equipment
> >>somewhere..
> 
> >That figures - and it may show that the problem lies with the tape/CD
> >combination and the way they have been cabled in. I think an active
> >terminator and the correct adaptors are called for :-)
> 
> Anytime you have mor than two devices active is always called for.
> Since you have both tape and CD they really should be on their own
> cable - narrow only.
> 
I came across a nice explanation at Adaptec's website, as I am working
on this problem in an NT environment currently.  Click on ->
http://www.adaptec.com/support/configuration/connect.html

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