problems with rdump

[David Finkelstein]

We're having a problem with rdump.  We have a nice 8mm dirve attached
to one of our Suns, and we'd like to rdump our A/UX drives to it.
Unfortunately, when we try to run rdump, we get the following error:

DUMP: Cannot open /dev/dsk/c3d0s0

We can run /etc/dump.bsd just fine and dump /dev/dsk/c3d0s0 to
/dev/null (for all the good it does us).

Has anybody else had this problem?  How have people been able to get
/etc/rdump to work?

Thanks,

David Finkelstein
Stanford University
davef at jessica.stanford.edu