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DEC tape drive via SunOS 4.1.3

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Last Modified: 2013-12-16
We have a Sun 4/280 running SunOS 4.1.3 with a DEC TLZ06 4mm drive on a SCSI bus which we use for backups.  The default mode for this drive is uncompressed mode.  How do we set
the drive to run in compressed mode?

The drive documentation, for Ultrix and VMS, states that the mode is determined based on the entry used in /dev, such as /dev/rmt?1 for uncompressed and /dev/rmt?h for compressed.  We don't have comparable device names on the Sun, and the only entries I'm aware of that access the drive do so in uncompressed mode.
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ive never seen one of these drives, however, most tape drives can be accessed in their higher capacity modes from 4.1.3 for writing in the following way eg:

/dev/nrst0 -  low capacity
/dev/nrst8 -  high capacity
/dev/nrst16 - compressed mode

if your drive only has two capacity levels then obviously you will only need two of the above.

----

if the above does not work then you will need to add the drive to the known drives in "/sys/scsi/targets/{st_conf.c,st_conf.h}" files. assuming that the DEC is like the drives i have then something like the following appended into st_conf.c (there is a structure there) might work:

/* DEC TLZ06 */
{
  "DEC TLZ06 Drive", 16,
  "initial_string_of_probe_scsi_command_here",
  ST_TYPE_TLZ06, 1024,
  (ST_VARIABLE | ST_BSF | ST_BSR | ST_LONG_ERASE),   5000, 5000,
  { 0x80, 0x81, 0x19, 0x18 },
  {  0, 0, 0, 0 }
}

---

then stick the following into st_conf.h:
#define ST_TYPE_TLZ06    0x31    /* DEC */

---

you will need to compile a new kernel for this to work... good luck

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