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What I want to do is to remove the copy of that LV from my PV dm-11, dm-10 and dm-14.
I tried this:
# lvconvert -m0 /dev/datavg/data /dev/dm-10 /dev/dm-11 /dev/dm-14
No free extents on physical volume "/dev/dm-10"
No free extents on physical volume "/dev/dm-11"
No mirror images found using specified PVs.
What did I do wrong? My goal was to remove devices dm-10, dm-11 and dm-14 from my VG, so I decided to extend the VG with dm-16 and mirror my data LV to that device, then split that mirror from the other devices. The FS is mounted and need to stay online...