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From: kabra437@pallas.athenanet.com (Ken Abrams)
Newsgroups: comp.unix.xenix.sco
Subject: Wangtek 125M tape w/SCO Xenix 2.2
Message-ID: <1071@pallas.athenanet.com>
Date: 22 Apr 91 21:32:17 GMT
Organization: Athenanet, Inc.,  Springfield, Illinois
Lines: 35

I have an AT&T 6386 with a Wangtek 60M tape and SCO Xenix 2.2.3.
I am about to change out the tape drive with another one that is
identical to the old one except it is 125M capacity (these tape units
have AT&T part numbers but are actually Wangtek made).

I would like to compare notes with someone who is using a 125M tape
drive and Xenix 2.2.  I think this should be a "plug and play" job
and I have asked SCO and "almost" got a good answer.

The key question hinges around an entry in /etc/default (and a related
backup command in cron).  The /etc/default/archive file contains this
entry which I use from sysadmin for backups:

cdev=/dev/rct0 desc="Cartrige Drive (600 ft tape)" \
blocking=20 size=600 density=20000

This works well with the 60M capacity drive and the backup program seems
to properly calculate when the tape will be full.  The question is: "What
do I change to get backup to recoginze the higher capacity?".  
Do I simply change the density to 40000?
The related cron command for daily backups is:

/bin/backup 9sdf 600 20000 /dev/rct0 /dev/u

and the same question applies. (change 20000 to 40000).

Mail advice would be much appreciated.  If there is sufficient interest,
I will post a summary.  


-- 
========================================================
Ken Abrams                     uunet!pallas!kabra437
Illinois Bell                  kabra437@athenanet.com
Springfield                    (voice) 217-753-7965