The attempt to create an unmirrored LV in a VG with mirror pools results in the following error:
# mklv -t jfs2 -p copy1=DC1 datavg01 10 0516-1829 mklv: Every mirror pool must contain a copy of the logical volume. 0516-822 mklv: Unable to create logical volume. #
The cause is the VG‘s Mirror Pool Strictness attribute, which is set to ‘super-strict‘. The article Mirror Pools: Understanding Mirror Pool Strictness examines the importance of Mirror Pool Strictness using examples.