Subject: Pb with a tape TRAVAN TR4 device

[Randy Gobbel]

At 10:26 AM +0200 8/1/97, Mr LEROY christophe wrote:
>I've a AHA-2940AU with two internal devices:
>scsi0: Target 1, channel A, now synchronous at 10.0MHz, offset 15.
>  Vendor: IBM       Model: DORS-32160        Rev: WA6A
>  Type:   Direct-Access                      ANSI SCSI revision: 02
>Detected scsi disk sda at scsi0, channel 0, id 1, lun 0
>scsi0: Target 2, channel A, now synchronous at 5.0MHz, offset 15.
>  Vendor: CONNER    Model: CTT8000-S         Rev: 1.07
>  Type:   Sequential-Access                  ANSI SCSI revision: 02
>
>When triing to position the tape using mt (mt rewind, mt fsf, etc...),
>If I'm in Single User Mode (Linux booted with -b option), it works fine, but
>In Multi user mode, It comes a Timeout on access to Disk during tape
>positioning.
>Could someone help me to solve this Probleme ???
>
>Christophe Leroy
>
>Here is my /proc/scsi/aic7xxx/0 then my kernel ring buffer contents
>
>Adaptec AIC7xxx driver version: 4.0/3.2/4.0
>
>Compile Options:
>  AIC7XXX_RESET_DELAY    : 15
>  AIC7XXX_TWIN_SUPPORT   : Enabled
>  AIC7XXX_TAGGED_QUEUEING: Disabled
>  AIC7XXX_PAGE_ENABLE    : Enabled
>  AIC7XXX_PROC_STATS     : Disabled
>
>Adapter Configuration:
>          SCSI Adapter: AHA-2940A Ultra
>                        (AIC-785x chipset)
>              Host Bus: Single
>               Base IO: 0xfc00
>                   IRQ: 11
>                  SCBs: Used 2, HW 3, Page 255
>            Interrupts: 5018
>         Serial EEPROM: True
>  Extended Translation: Enabled
>        SCSI Bus Reset: Disabled
>            Ultra SCSI: Disabled
>     Target Disconnect: Disabled

I have the same model tape drive on my PPro w/ AHA2940-UW running Linux
2.0.30, and it works fine.  I suspect that you need to enable Target
Disconnect.  It's also a good idea to enable SCSI Bus Reset, and it doesn't
hurt anything to enable Ultra SCSI either.  I think there's somewhere in
the documentation for the tape drive where it says to disable disconnect,
but when I tried it my system blew up in my face--don't recall if it was
precisely the same problem you had, but in any case it didn't work.
Enabling disconnect doesn't hurt anything, and my tape drive works
perfectly.

-Randy