Date: Wed, 28 Oct 2009 05:42:34 -0400 From: Dan Langille <dan@langille.org> To: Adam McDougall <mcdouga9@egr.msu.edu> Cc: freebsd-scsi@freebsd.org Subject: Re: tape changer, but not tape drive Message-ID: <4AE8120A.70608@langille.org> In-Reply-To: <20091028021932.GL62972@egr.msu.edu> References: <4AE7A0BB.8020402@langille.org> <20091028021932.GL62972@egr.msu.edu>
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Adam McDougall wrote: > On Tue, Oct 27, 2009 at 09:39:07PM -0400, Dan Langille wrote: > > I first encountered this problem in April, now I'm back to it: > > http://lists.freebsd.org/pipermail/freebsd-scsi/2008-April/003452.html > > In short, the system has tape library. The library has worked in the > past (http://www.freebsddiary.org/digital-tl891.php) but now it does > not. I can see either the tape library or the tape drive. Which I see > depends upon the cable configuration. > > http://www.freebsddiary.org/images/tape-libraries-cables.jpg > > As shown above, that's how I would expect things to work normally. > However, in that configuration, I do not see the tape drive. The cable > going down, goes to the computer. If I reconnect that cable to the plug > to the left of the terminator, the system can see the DLT drive, but not > the tape library. > > Under 6.3-STABLE FreeBSD, I can see either one device or the other. > > ch0 at ahc0 bus 0 target 0 lun 0 > ch0: Removable Changer SCSI-2 device > ch0: 20.000MB/s transfers (10.000MHz, offset 8, 16bit) > ch0: 10 slots, 1 drive, 1 picker, 0 portals > > or > > sa0 at ahc0 bus 0 target 1 lun 0 > sa0: Removable Sequential Access SCSI-2 device > sa0: 20.000MB/s transfers (10.000MHz, offset 8, 16bit) > acd0: FAILURE - INQUIRY ILLEGAL REQUEST asc=0x24 ascq=0x00 sks=0x40 0x00 > 0x01 > > Any ideas? > > Full dmesg output here: http://www.langille.org/tmp/dmesg.boot > > TIA. > > Is it possible the middle cable is broken in some way? Perhaps you > could swap it with another cable to try to find out, such as with > the cable going from the library to the 2944 card. Might be intermittant > and start working if bent or moved. I did try that. I used the cable from my stand-alone DLT drive, which has been used before (and after) and is known to be good. > Also can you see the connectors > inside the library (on the back side of the external plate) to check > if they are well seated or damaged? I'll pull the unit apart and have a look. I have been in there before. Since it last worked, the unit has gone through two moves. > You could also try swapping the > first and second connection or the third and fourth, or both, if it is > hooked up like I think it is, those should have an equal chance of working > and might reveal a bad port or partially bad port. I did try moving the looped cable to plugs 1&2 and connecting my computer to plug 3. > Also try leaving off > the terminator or one/both ends of the middle cable just to see if the > system can tell the difference especially while booting, just to confirm > if it makes any negative difference at all. OK, I will try that. Thank you.
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