dump cannot read disk

[Roberto Togneri]

Hi,
	I just grabbed the dump binaries and tried to get it to work on
our 4d/20 irises (OS 3.1d) and this is what I got:

# dump 0f /dev/tape /
  DUMP: Date of this level 0 dump: Tue Mar 12 12:25:44 1991
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/rroot (/) to /dev/tape
read: Invalid argument
  DUMP: (This should not happen) bread from /dev/rroot [block 1]: count=512, got=-512
  DUMP: bad magic number (0x0) in superblock
  DUMP: The ENTIRE dump is aborted.

Could this be something to do with our OS (which is now out of date!)?
Would recompiling the sources on our system fix this? If so can I get
them from somewhere?

Hope somebody can shed some light on this.

Thanks,
--
Dr. Roberto Togneri                         Phone: +61-9-380-2535
Dept. of Electrical & Electronic Engineering
The University of Western Australia         Fax:   +61-9-380-1065
NEDLANDS WA 6009 Australia                  Email: robert at swanee.ee.uwa.oz.au