Most IBM Power Systems these days have a Virtual I/O Server, commonly known as the VIOS.
The VIOS facilitates the sharing of physical I/O resources. In other words, you don't need to assign an adapter for disk for each logical partition, and then another adapter for the network traffic. Instead, the VIOS owns the adapters and then you can share the resources (disk and network) by creating virtual adapters.
The benefit? This greatly reduces the amount of I/O drawers, cabling and configuration, so it makes it easy for you to have multiple logical partitions on the same physical Power System.
Now there are a lot of people who are really strong at AIX or IBM i but perhaps not so confident about setting up or even looking at the VIOS. In fact, I wonder whether there may be one or two people in the industry who positively avoid it, perhaps preferring to stay in their own OS comfort zone. I perfectly understand that. However, not working on the VIOS can be really holding you back if you want to manage your Power Systems more effectively.
The good news is that the Virtual I/O Server is not at all hard to learn, as it's a tiny subset of the commands or functions you need to know compared to an AIX or IBM i logical partition, so if you know of anyone who is afraid of the VIOS, or suffering of VIOS phobia, they would do well to watch this video.
Update: Although the original video is no longer available, this other one from "Mr NMon", Nigel Griffiths, will walk you through the VIOS installation process.