New answers tagged snapshot
run watch -n 1 "ps auxf | grep lvm | grep -v grep" And check to see if the time column is going up. If it is you know the program is using CPU time.
When running lvconvert, use the interval flag. From the man page: -i, --interval Seconds Report progress as a percentage at regular intervals.
The idea may be reasonable but dd is the killer for all efforts. You will not get neither speed nor space-saving. With differential coping at least space-saving may available. Can try lvmsync to do It. Another option is ZFS (zfsonlinux) where you can do clones from snapshots. But I am not sure about ZVOL perfomance on Linux.
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