dump restore problem

[Tomi Vainio - Sun Finland]

During my ufs2 migration I've used piped dump restore procedure.  Is
it normal that block sizes like 512 or 1000 don't work?  Block size
512 gives an error and 1000 hangs forever while 126 is working fine.

dump 0buf 512 - / | restore xbf 512 -
  DUMP: WARNING: should use -L when dumping live filesystems!
  DUMP: Date of this level 0 dump: Sun Apr 27 00:39:58 2003
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/da0s1a (/) to standard output
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 236454 tape blocks.
  DUMP: dumping (Pass III) [directories]
  DUMP: master/slave protocol botched.
  DUMP: The ENTIRE dump is aborted.
Tape is not a dump tape

  Tomppa