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.
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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.