[HPADM] fbackup can store only 18-19 gigabytes on dds4 tape drive

Hi Admins,

I have a problem with our backup tape. We use a HP DDS4 Tape Drive
(HP C5683A) on a HP B2000 workstation with HP-UX 10.20 installed.

From fbackup I get this messages:
....
fbackup(3003): normal EOT
fbackup(3316): enter 'yes' when volume 2 is ready on /dev/rmt/1m, or 'no' to discontinue:
fbackup(3004): writer aborting
...

EOT means "End Of Tape". But, the amount of the 4 directories, I want
to be backuped, is about 18.5 Gigabyte. I checked this with "du -sk".
A DDS4 should hold 20-40GB.

The device file is:
# ll /dev/rmt/1m
crw-rw-rw- 2 bin  bin 205 0x033000 Jan 27 03:48 /dev/rmt/1m

result of du -sk:
17838163  /path/to/dir1
29210  /path/to/dir2
145254  /path/to/dir3
11278   /path/to/dir4


Does anybody has an idea why I can't write more than about 18-19 GB
to the tape drive?

Thank you for response :-)
Kurt

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Kurt Freydl               phone:  +41 (0)52 269 07 77
leuthold + partner ag     fax:    +41 (0)52 269 07 79
Technikumstrasse 38       e-mail: mailto:kf@xxxxxxxxxxxxxxxxxxx
CH-8400 Winterthur        Switzerland
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