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 > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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