*BSD News Article 59185


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From: patton@sysnet.net     (Matthew Patton)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Support for HW compression DATs??
Date: 10 Jan 1996 15:28:38 GMT
Organization: Defense Information Systems Agency
Lines: 24
Message-ID: <4d0lv6$kce@unix2.sysnet.net>
Reply-To: patton@sysnet.net    (Matthew Patton)
NNTP-Posting-Host: ppp4.sysnet.net
X-Newsreader: IBM NewsReader/2 v1.2

I have an Archive 2gig DAT that does hardware compression.  According to my
kernal it's a 'generic' 3.81mm device.  Needless to say, it doesn't enable the
hardware compression mode.

1) How do I build specific device support into the kernel?
 (assuming it's necessary, and where to find the parameters needed in 'scsi_tape.h')

2) How to make the necessary /dev devices.  (No, they AREN'T in MAKEDEV.)

3) What the major and minor numbers mean. (a good reference somewhere?)

4) What are the defined SCSI2 density codes?

At a different installation which used DEC Ultrix, we had /dev/rmt08's with a
trailing 'h' or 'l' to indicate the density.  In my case, the devices are /dev/st0,1.
Anyone know what a /dev/st20 is?  Surely they don't mean the 20'th tape device!

Thanks for the assistance.

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Copyright, Matthew E. Patton, 1995.