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I wanted to create a copy of my whole laptop disk on an lvm disk of the same size.
First I created the logical volume: lvcreate -L120G -nlaptop mylvms
SOURCE: dd if=/dev/sda bs=16065b | netcat ip-target 1234
TARGET: nc -l -p 1234 | dd of=/dev/mapper/mylvms-laptop bs=16065b
to follow its process you issue the following command in a different terminal
STATS: on target in a different terminal: watch -n60 -- kill -USR1 $(pgrep dd)
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