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Date:      Fri, 24 Nov 2000 13:03:43 -0500 (EST)
From:      Paul Southworth <pauls@etext.org>
To:        Greg Lehey <grog@lemis.com>
Cc:        "Eric S. Nooden" <noodene@beloit.edu>, Michael Hughes <mhughes@bridge.com>, freebsd-questions@freebsd.org, freebsd-scsi@freebsd.org
Subject:   Re: Mounting a SCSI tape drive
Message-ID:  <Pine.BSF.4.21.0011241234260.30979-100000@locust.etext.org>
In-Reply-To: <19991202195345.47886@mojave.sitaranetworks.com>

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[About a year ago there was a thread on freebsd-questions about Exabyte
8200 drives which I would like to revive with the hope that someone found
a solution.]

On Thu, 2 Dec 1999, Greg Lehey wrote:

:On Thursday,  2 December 1999 at 15:17:47 -0600, Eric S. Nooden wrote:
:> At 02:29 PM 12/2/99 -0600, Michael Hughes wrote:
:>> Eric S. Nooden said in email to me:
:>>>
:>>> I am running into some problems trying to mount a tape drive.  When I run:
:>>>
:>>> mt -f /dev/nrsa0 rewind   (or any command i.e. status)
:>>>
:>>> I get the following error message:
:>>>
:>>> (sa0:ahc0:0:4:0): MODE SENSE(06).  CDB:  1a 0 0 0 c 0
:>>> (sa0:ahc0:0:4:0): ILLEGAL REQUEST
:>>>
:>>> ***I did notice that when the command ran, the light on the tape drive did
:>>> flash.
:>>>
:>>> The file /var/log/messages reports the following about sa0:
:>>>
:>>> sa0: at ahc0 bus 0 target 4 lun 0
:>>> sa0: <EXABYTE EXB-8200 2680> Removable Sequential Access SCSI-CCS device
:>>> sa0: 3.300MB/s transfers

I have what appears to be an almost identical drive.  Mine is reported
as "<EXABYTE EXB-8200 IRM4> Removable Sequential Access SCSI-CCS device".

This was a drive Exabyte made OEM for IBM and was sold in RS/6000s ten
years ago, white faceplate and round blue eject button.  I am aware that
it is a piece of crap - if I can make it work this whole machine is going
to a charitable cause, otherwise the drive goes to the dumpster.

I have it attached to a SCSI bus with a hard drive attached (id #0).  The
tape is id #1.  The host adapter is an Adaptec 2930C at id #7.  I have
verified no SCSI ID conflicts by removing each device and probing.

I get the exact same error message when I 'mt -f /dev/rsa0 status'.

I am running a 4.1.1 GENERIC kernel (freshly installed OS).

:>>> Any help in mounting this beast and get backups done would be appreciated.
:>>
:>>   Type changing dup switch 4 to on, on the MX Card.
:>
:> Thanks for replying.  I unfortunately must show my ignorance and ask "What
:> is an MX Card?"  Are you referring to the SCCI controller or a card
:> physically attached to the tape drive.
:
:I believe the MX board is the second from the back ot the unit.  You
:should see an 8-position DIP switch on the right (looking from the
:front).  Unfortunately, the units I have have special screws for which
:I don't have any screwdrivers available here.  I'll see if I can
:arrange something tomorrow.

The small screws are Torx T-8 and the large are T-10.  Examining the MX 2
card DIP block, factory settings were different from what I find on
Exabyte's web site.  They say default is all switches "off".

http://www.exabyte.com/suppserv/techsupp/8mm/fullhigh/in0011.html

On mine, switches 2, 3, 4, 5, and 8 were on by default (ie, for use in an
RS/6000).

I tried moving all switches to off, and all switches off but 4 on.

When switch 4 is _off_ the drive returns an error immediately after an 
'mt -f /dev/rsa0 status'.  If switch 4 is _on_ it takes about 10 seconds
and then returns the same error, after blinking the drive lights and
making it's little Exabyte tape tensioning noises.

I realize that Exabyte shipped drives with insane firmware variations
(especially OEM) but this drive previously worked (a while ago) in a Linux
box (Intel hardware) with a 1.2 kernel, which seems like a good sign.

If anyone has the dirt on this drive, please drop me a note.

--Paul

Copyright (c) 1992-2000 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
	The Regents of the University of California. All rights reserved.
FreeBSD 4.1.1-RELEASE #0: Tue Sep 26 00:46:59 GMT 2000
    jkh@narf.osd.bsdi.com:/usr/src/sys/compile/GENERIC
Timecounter "i8254"  frequency 1193182 Hz
CPU: Pentium/P54C (99.87-MHz 586-class CPU)
  Origin = "GenuineIntel"  Id = 0x526  Stepping = 6
  Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>
real memory  = 33488896 (32704K bytes)
config> di sn0
config> di lnc0
config> di le0
config> di ie0
config> di fe0
config> di ed0
config> di cs0
config> di bt0
config> di ata1
config> di ata0
config> di aic0
config> di aha0
config> di adv0
config> q
avail memory = 28614656 (27944K bytes)
Preloaded elf kernel "kernel" at 0xc0416000.
Preloaded userconfig_script "/boot/kernel.conf" at 0xc041609c.
Intel Pentium detected, installing workaround for F00F bug
md0: Malloc disk
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcib0: <Host to PCI bridge> on motherboard
pci0: <PCI bus> on pcib0
isab0: <Intel 82371AB PCI to ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX4 ATA33 controller> port 0xffa0-0xffaf at device 7.1 on pci0
atapci0: Busmastering DMA not enabled
uhci0: <Intel 82371AB/EB (PIIX4) USB controller> port 0xef80-0xef9f irq 11 at device 7.2 on pci0
usb0: <Intel 82371AB/EB (PIIX4) USB controller> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
chip1: <Intel 82371AB Power management controller> port 0xfcb0-0xfcbf at device 7.3 on pci0
ahc0: <Adaptec 2910/15/20/30C SCSI adapter> port 0xec00-0xecff mem 0xfebef000-0xfebeffff irq 9 at device 18.0 on pci0
aic7850: Single Channel A, SCSI Id=7, 3/255 SCBs
pci0: <S3 Trio 64V2/DX/GX graphics accelerator> at 20.0 irq 11
ep0: <3Com 3C509-Combo EtherLink III> at port 0x300-0x30f irq 10 on isa0
ep0: Ethernet address 00:a0:24:4d:35:5f
fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
sio1 at port 0x2f8-0x2ff irq 3 on isa0
sio1: type 16550A
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/9 bytes threshold
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
Waiting 15 seconds for SCSI devices to settle
sa0 at ahc0 bus 0 target 1 lun 0
sa0: <EXABYTE EXB-8200 IRM4> Removable Sequential Access SCSI-CCS device 
sa0: 3.300MB/s transfers
da0 at ahc0 bus 0 target 0 lun 0
da0: <SEAGATE ST15150N 0023> Fixed Direct Access SCSI-2 device 
da0: 10.000MB/s transfers (10.000MHz, offset 15)
da0: 4095MB (8388315 512 byte sectors: 255H 63S/T 522C)
Mounting root from ufs:/dev/da0s1a
(sa0:ahc0:0:1:0): MODE SENSE(06). CDB: 1a 0 0 0 c 0 
(sa0:ahc0:0:1:0): ILLEGAL REQUEST
(sa0:ahc0:0:1:0): MODE SENSE(06). CDB: 1a 0 0 0 c 0 
(sa0:ahc0:0:1:0): ILLEGAL REQUEST
(sa0:ahc0:0:1:0): MODE SENSE(06). CDB: 1a 0 0 0 c 0 
(sa0:ahc0:0:1:0): ILLEGAL REQUEST
(sa0:ahc0:0:1:0): MODE SENSE(06). CDB: 1a 0 0 0 c 0 
(sa0:ahc0:0:1:0): ILLEGAL REQUEST
(sa0:ahc0:0:1:0): MODE SENSE(06). CDB: 1a 0 0 0 c 0 
(sa0:ahc0:0:1:0): ILLEGAL REQUEST
(sa0:ahc0:0:1:0): MODE SENSE(06). CDB: 1a 0 0 0 c 0 
(sa0:ahc0:0:1:0): ILLEGAL REQUEST



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