AIX geeks, converting from SDDPCM to AIXPCM, when you uninstall the drivers, you also need to uninstall host attachment. On 2% of our migrations, mksysb/alt clones would fail to find the boot disk (554).
Note that from SVC 7.6.1, AIX 6.1.8, AIX 7.1.3, and AIX 7.2, you MAY switch to AIXPCM. On POWER9 and later, you MUST switch to AIXPCM.
The rm script is from storage development, but the manage_disk_drivers command is from AIX dev. Either is okay, but tge AIX one does not require making a PMR.