Date: Thu, 29 Jan 2004 06:13:08 -0800 (PST) From: Don Lewis <truckman@FreeBSD.org> To: jesse@wingnet.net Cc: freebsd-scsi@FreeBSD.org Subject: Re: adaptec 2940u/uw dump card state ends Message-ID: <200401291413.i0TED87E086929@gw.catspoiler.org> In-Reply-To: <bvb32r$jlk$1@sea.gmane.org>
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On 29 Jan, Jesse Guardiani wrote: > Don Lewis wrote: > > > [...] > >> My first guess would not be termination. I would think that a >> termination problem would muck up data transfers and would affect all >> attempts to use the changer. > > Well, it may be too soon to tell, but this past Monday (or maybe Sunday? I > can't remember) the machine spontaneously rebooted on me during a backup > cycle to the tape drive. It was midnight, but I decided to take a trip to > the office and have a look at it anyway. > > In the adaptec SCSI controller, I had the termination set to OFF for the LOW > and HIGH parts of the bus. I changed this to AUTO for LOW and AUTO for HIGH > and I turned off Ultra SCSI capability on the controller. > > I'm not sure which of those changes fixed the problem, but so far - 3 or 4 > days later - I haven't seen a single timeout and no spontaneous reboots. > > Hopefully it's fixed! > > >> How is the changer connected to the 2940u/uw? If you are using an eight >> bit cable > > Not sure what "bit" count it has, but it's an external wide cable. 50 pin, > maybe? That would be narrow/8-bit SCSI. wide/16-bit SCSI uses a 68 pin cable. >> you'll want to configure the 2940u/uw to terminate the upper >> 8 bits of the bus but not the lower 8. > > I think this may have been the problem. Setting both halves to "auto" > probably fixed it. If you previously had both upper and lower termination turned off on the controller, the upper 8 bits of your SCSI bus were only terminated on one end of the bus ...
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