Using migratepv will just move the PPs. Their contents will remain the same through the process, although you are right, you can do this with the filesystem in use. The problem is, you will still have your data spread over all the PPs.

What is the eventual aim of all this anyway? It could be to free a LUN or to create another LV for another purpose. It would be good to know.



Robin

P.S. if you considered adding a mirror, synchronising them and then dropping the original, you are still going to have data across your PPs as the mirror is at the PP level.