LinuxSA Mailing list archives

  From: Glen Turner <glen.turner@aarnet.edu.au>
  To  : Andrew Reid <andrew.reid@plug.cx>
  Date: Thu, 30 Nov 2000 20:26:13 +1030

Re: DAT Drive Wierdness

Andrew Reid wrote:
> 
> All-of-a-sudden, the tape device (/dev/st0) reports as no device when I
> use mt (ie mt -f /dev/st0 rewind) it gives me a "/dev/st0 - no such
> device

Have a look at the startup messages (using dmesg) and make
sure that the drive is still being assigned st0.  You should
see a line like the last line of this output:

> scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.28/3.2.4
>        <Adaptec AHA-294X SCSI host adapter>
> scsi : 1 host.
> (scsi0:0:6:0) Synchronous at 10.0 Mbyte/sec, offset 8.
>   Vendor: HP        Model: C1533A            Rev: 9608
>   Type:   Sequential-Access                  ANSI SCSI revision: 02
> Detected scsi tape st0 at scsi0, channel 0, id 6, lun 0

Also make sure that the /etc/modules.conf file is correct.   You
need to define the controller.  And then define the st middle
level driver for the device minor number that was discovered.

> # Controller: AHA-2940 (PCI), a AIC-7xxx variant
> #   SCSI physical: narrow, not differential
> #   SCSI ID: 7
> #   Connector: HP-CEN
> alias scsi_hostadapter aic7xxx
> # Tape: HP SureStore 6000 (model C1529-62702), 6MB on 120m DAT-2 with compression
> #   SCSI physical: narrow, not differential
> #   SCSI ID: 5
> #   Connector: Centronics
> #   Termination: external passive Centronics
> # it is the zeroth (and only) device detected on the SCSI
> # bus, so has minor number 0 for /dev/st0 and 128 for
> # /dev/nst0.
> alias char-major-9-0 st
> alias char-major-9-128 st

You should also have some symbolic links to the default tape drive:

  cd /dev
  ln -s st0 tape
  ln -s nst0 ntape

This is all a right pain, and it takes a while to get your
head about the way Linux treats SCSI tape drives.  devfs in
2.4 fixes a lot of this nonsense.

-- 
 Glen Turner                                 Network Engineer
 (08) 8303 3936      Australian Academic and Research Network
 glen.turner@aarnet.edu.au          http://www.aarnet.edu.au/
--
 The revolution will not be televised, it will be digitised

-- 
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