To clean up the operating system device tree after removing LUNs
# lsdev -Cc disk hdisk431 Defined 09-08-02 IBM 2810XIV Non-MPIO Fibre Channel Disk hdisk432 Defined 0A-08-02 IBM 2810XIV Non-MPIO Fibre Channel Disk
# rmdev -dl hdisk-name
# rmdev -dl hdisk431
# rmdev -dl hdisk432
Repeat step 1 and verify that no devices are shown as Defined.