To remove a logical volume, use rmlv. The -f switch is to remove without user confirmation.

Usage: rmlv [ -B ] [ -f ]  [ -p Physical Volume ]  LogicalVolume …
Removes a logical volume.

root@aix:/ # /usr/sbin/rmlv -f rawdevice19
rmlv: Logical volume rawdevice19 is removed.

• AIX