WangDAT 4mm tape usage questions
Hans Dietrich
xcc!hd at relay.eu.net
Wed Dec 12 21:48:14 AEST 1990
In article <637 at brchh104.bnr.ca> dan at asihub.autosys.com (Dan O'Neill) writes:
>I am looking for information regarding the usage of a WangDAT drive on a
>Sun system. We've been experimenting with the tape drive and have been
>experiencing back times like:
>
>4.7hrs to backup 500mb using dump with the following parameters
>"dump 5ubdfs 4096 488000 /dev/rst0 200 /filesys"
I had the same problem with the above mentioned configuration a while ago.
By default the WangDAT isn't among the st-devices which the kernel knows
about. So it uses some default values which are leading to the bad results
in backup time.
To get a fast backup you have to modify the file "st_conf.c" under
"/usr/kvm/sys/scsi/targets":
1. Search for the entry for the Exabyte 8mm cartridge
2. duplicate it
[ 3. change the comment (e.g. WangDAT 4mm cartridge) ]
4. change the line
"Exabyte", 7, "EXABYTE", ST_TYPE_EXABYTE, 1024,
to
"Wangdat", 7, "WangDAT", ST_TYPE_EXABYTE, 1024,
Now recompile the kernel, install it, reboot and have fun!
(The dump command I use is:
dump 0acbdfsu /etc/dumpfiles.1h0 126 27000 /dev/nrst1 6000 /dev/rsd1h)
Hans Dietrich Voice: +49 (2101) 44 05-50
X Computer Consult GmbH Fax: +49 (2102) 44 05-66
D-4030 Ratingen Mail: dietrich at xcc.de
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