When migrating LPARs using LPM onto a somewhat older hardware, the following error can occur:
HSCLB505 The partition cannot use hardware-accelerated encryption on the destination managed system because the destination managed system does not support hardware-accelerated encryption.
This means that hardware-accelerated encryption is activated for the LPAR, but is not supported on the destination managed system.
Disabling hardware-accelerated encryption using the LPAR-Tool is easy:
$ lpar -d chmem lpar01 hardware_mem_encryption=0 $
Without the LPAR-Tool this is of course also possible. Log into your HMC and use the following command from the commandoline:
chhwres -m ms01 -r mem -o s -p lpar01 -a 'hardware_mem_encryption=0'
Afterwards validation and migration using LPM should work.