Creating LPAR configurations from the HMC GUI can be slow and inefficient. I prefer to use the HMC command line "mksyscfg" to create LPAR's. The output of the "lssyscfg" (List system configuration) command is almost the same as the input to the "mksyscfg" (make system configuration) command.
Below are a couple of 1-line commands for the HMC that will transform the output of "lssyscfg" in to a useable "mksyscfg" command line.
This allows some interesting possibilities:
If you need to create several LPAR's with a similar configuration, you can create the first one in the HMC GUI, and then use this method to produce a "mksyscfg" command line. You can then tweak the mksyscfg command line for the additional LPAR's and quickly create as many as you need very quickly and accurately.
If you are migrating a LPAR from one machine to another this would allow you to quickly and easily create a new LPAR on the new machine which matches the original.
You can periodically gather this information for all your LPAR's. In a Disaster Recovery situation you would have the command lines ready to go to create all of your LPAR's very quickly. Of course you could also use the HMC functionality to backup/restore profile data as well. The info outlined in this method could be another option for recovery and might be more flexible then having to restore all the profile data using the normal HMC restore method.
This method creates an identical copy to the LPAR you are cloning, so you need to watch out for things such as physical slots, Virtual I/O slot numbers, and LPAR id's and tweak the mksyscfg line as necessary.
To generate a "mksyscfg" command line from a single LPAR, run the following command on the HMC (this should all be on 1 long line). Change the highlighted yellow parts with the name of the LPAR and the managed system name: