The following error message occurred while creating a mirrored logical volume:
# mklv -c 2 -t jfs2 datavg01 10 0516-1814 lcreatelv: Mirror pools must be defined for each copy when strict mirror pools are enabled. 0516-822 mklv: Unable to create logical volume. #
The reason for this is that the mirror pool strictness is set for the volume group. The article Mirror Pools: Understanding Mirror Pool Strictness examines and explains this in more detail.