Date: Wed, 28 Oct 2009 20:32:42 -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: <4AE8E2AA.7020901@langille.org> In-Reply-To: <4AE8D01A.9020707@langille.org> References: <4AE7A0BB.8020402@langille.org> <20091028021932.GL62972@egr.msu.edu> <4AE8120A.70608@langille.org> <4AE84250.8020409@egr.msu.edu> <4AE8D01A.9020707@langille.org>
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Dan Langille wrote: > Adam McDougall wrote: >> Dan Langille wrote: >>> 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. >> The two plugs for each device (library, tape1, tape2) are probably >> tied directly together in a Y >> shape to the internal device so you can use them as an In/Out, so >> putting the looped cable on >> plugs 1 and 2 probably does nothing and isolates that device from the >> rest. As long as the looped >> cable is not between 1&2 or 3&4, you can probably use any other order >> although the manufacturer >> may have recommendations. I see nothing wrong with the way you appear >> to have cabled it but >> variations may reveal something. > > I looked inside. Nothing obviously disconnected etc. > > I tried connecting the computer into plug 1, leaving 2 and 3 empty. > Regardless of whether or not the terminator is in plug 4, FreeBSD does > not see the tape drive. > > FWIW, I went into the SCSI utility for the SCSI card during boot. > > ahc0: <Adaptec 2944 Ultra SCSI adapter> port 0x9400-0x94ff mem > 0xfb400000-0xfb400fff irq 16 at device 9.0 on pci0 > ahc0: [GIANT-LOCKED] Is this the appropriate card to be using with this device? There is a label on the back of the library saying: SCSI DIFF I know the unit is configured to use SCSI-2 > The card itself sees only the library, not the drive. Thus, I conclude > this is something outside FreeBSD (so far). > >>> >>>> 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. > > No difference. > _______________________________________________ > freebsd-scsi@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-scsi > To unsubscribe, send any mail to "freebsd-scsi-unsubscribe@freebsd.org"
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