Answer Posted / mario

first:# vi /etc/fstab
deleted line /dev/mapper/vg/lv ..............default 0 0
esc wq!
#reboot
#lvremove(path i.e: /dev/mapper/vg/lv)
#vgremove(path i.e: vg /dev/sdb1)
#pvremove(path i.e: /dev/sdb1)

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