Here's the command I'm planning to use for dumping across a network:
dump -0u -B 8000000 -f - /dev/sd0a | gzip | ssh host 'dd obs=32k of=/dev/nrst0'
Notice I define a blocksize on the dd command, but I haven't defined one
anywhere else. This was after a write failuer with no block size set on a
big backup. Someone suggested setting the block size miught help. I'm not
too sure what the ramifications of this are. Is it a Bad Thing to mix the
block size? I don't believe gzip gives you an option for setting block
size. Should I worry? A couple of test backups and retores seemed to work