Date: Wed, 28 Oct 2009 19:13:30 -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: <4AE8D01A.9020707@langille.org> In-Reply-To: <4AE84250.8020409@egr.msu.edu> References: <4AE7A0BB.8020402@langille.org> <20091028021932.GL62972@egr.msu.edu> <4AE8120A.70608@langille.org> <4AE84250.8020409@egr.msu.edu>
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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] 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.
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