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Date: Sat, 30 May 98 15:09:57 PDT
From: john@fea.com (John Fox)
Message-Id: <9805302209.AA11986@dollar.fea.com>
To: freebsd-questions@FreeBSD.ORG
Subject: compressed mode on SCSI DAT drive DEC TLZ06
Cc: john@fea.com
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I have a couple of DEC TLZ06 SCSI tape drives that support uncompressed
and compressed modes.  I have a manual that says 0xfe is the (vendor
specific) density code for compressed mode and 0xfd for uncompressed.
The drives work fine in the uncompressed mode (using the DDS density
code 0x13).  But I don't know how to reset the density for the
compressed mode.  "mt density 0xfe" doesn't work.  It says "mt:
density:  Invalid argument" and logs

/kernel: st0(ahc0:4:0): ILLEGAL REQUEST asc:26,0 Invalid field in parameter list sks:8f,4
/kernel: st0: Cannot set selected mode

The manual has instructions for reconfiguring the SunOS kernel, but I
can't see any clear way to apply them to any of the tables in
/sys/scsi/scsiconf.c.

Thanks for any pointers.

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