Date: Thu, 29 Jan 2004 08:50:17 -0500 From: Jesse Guardiani <jesse@wingnet.net> To: freebsd-scsi@freebsd.org Subject: Re: adaptec 2940u/uw dump card state ends Message-ID: <bvb32r$jlk$1@sea.gmane.org> References: <buriui$2ks$1@sea.gmane.org> <200401240215.i0O2FY7E068846@gw.catspoiler.org>
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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 long is the time from when you issue the changer command to when the > driver coughs up this error? I'm not familiar with this drive/changer > combination, but the DDS changer that I use takes a lot longer to swap > tapes if the tape currently in the drive is wound all the way to the > end, because the drive first has to rewind it before it can unload the > tape. Subsequent tape changes won't take as long if the tape currently > in the drive is still at the beginning ... > > 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? > 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. -- Jesse Guardiani, Systems Administrator WingNET Internet Services, P.O. Box 2605 // Cleveland, TN 37320-2605 423-559-LINK (v) 423-559-5145 (f) http://www.wingnet.net
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