It's actually copying the data. Splicing wouldn't be possible (maybe?), since NBD is a client/server protocol.
The difference between nbdcopy ... /dev/null and nbdcopy ... null: is that in the second case we avoid writing the data anywhere and just throw it away inside nbdcopy.
It's actually copying the data. Splicing wouldn't be possible (maybe?), since NBD is a client/server protocol.
The difference between nbdcopy ... /dev/null and nbdcopy ... null: is that in the second case we avoid writing the data anywhere and just throw it away inside nbdcopy.