我遇到这样的问题，终于解决了。下面是操作方法：
to fix the "locked" error, you first need to deactivate your lv
# lvchange -an /dev/vg/lv
then edit your vg backup (/etc/lvm/backup/vg) and remove "LOCKED" in the
lv status line.
after that do
# vgcfgrestore vg
# lvchange -ay /dev/vg/lv
when doing lvreduce now, everything should work properly.
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