Date: Wed, 13 Oct 1999 11:22:42 -0500 From: "Andy Angrick" <angrick@netdirect.net> To: "David Wolfskill" <dhw@whistle.com> Cc: "freebsd-isp" <freebsd-isp@FreeBSD.org> Subject: RE: wierd SCSI problems Message-ID: <NDBBJDAGOKOGNKPLFIBPKEFACMAA.angrick@netdirect.net> In-Reply-To: <199910131622.JAA31137@pau-amma.whistle.com>
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Here's a crude diagram
adapter------>|----->----->|------->|active terminator|
2940UW | |
68-50pin cnvtr 68-50pin cnvtr
| |
drive0 drive1
the adapter is set to automatic termination i believe. I'll need to check
the bios.
-Andy
> -----Original Message-----
> From: David Wolfskill [mailto:dhw@whistle.com]
> Sent: Wednesday, October 13, 1999 11:22 AM
> To: angrick@netdirect.net; freebsd-isp@FreeBSD.ORG
> Subject: Re: wierd SCSI problems
>
>
> >From: "Andy Angrick" <angrick@netdirect.net>
> >Date: Wed, 13 Oct 1999 09:59:25 -0500
>
> >I have an intermittent SCSI problem that doesn't seem to have a
> pattern. I'm
> >using 2.2.8.-RELEASE, adaptec 2940UW SCSI controller, and 2
> compaq DGHS18Y
> >18GB SCSI drives (separate drives...no mirrors or RAID. Second drive is
> >mounted as /usr2). They have a 50-68 pin convertor on both of them. my
> >connector has 3 ends..3rd end is connected to an active terminator.
>
> At this point, even a crude ASCII diagram, showing the termination
> points, as well as active components on the SCSI chain, would be
> helpful.
>
> >The problem is that the system locks up and stops responding
> spiratically.
> >....
>
> >Anyone have a clue as to what might be going on? If it was a cable issue,
> >you'd think that it would either work or it wouldn't.....
>
> No, I wouldn't think that. I would first suspect termination or cable.
>
> Each signal line needs to be terminated at each of its 2 ends. (The
> purpose is to reduce the strength of signals that are reflected off the
> end -- think of looking in a store window on a sunny day.)
>
> Don't forget to to check the termination on the host adaptor.
>
> Cheers,
> david
> --
> David Wolfskill dhw@whistle.com UNIX System
> Administrator
> voice: (650) 577-7158 pager: (888) 347-0197 FAX: (650) 372-5915
>
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