Load balancing among multiple controllers of UltraPath

Environment: As shown in the following figure, a distributed switch is configured on the ESXi. Two vmkernel networks (vmk1 and vmk2) are added to the ESXi. UltraPath is installed on the ESXi and iSCSI Target on the four storage devices is added. After the configuration, load balancing takes effect only on P0 and P1 of SP/Controller A, the two ports in the SP/Controller B do not have data and do not work in load balancing mode.

The following information is found: The multipathing mechanism of the front-end controller can be classified into the following types:
1. A/A: Symmetric Active/Acivie: For a specific LUN, the target ports of the two storage controllers in the path are in the active / optimized (active/optimized) state. The two controllers communicate with each other at a high speed. One I/O is sent to the control end, and the two controllers can participate in the processing at the same time. When a controller is busy, the system does not need the load balancing software on the host to implement load balancing.
2. ALUA: Asymmetric Active/Active: For a specific LUN, the target port of one controller in its path is in the active / optimized (active/optimized) state, and the target port of the other controller is in the active / non-optimized (active/unoptimized) state. At a certain time, a LUN belongs to only one controller. To implement load balancing on both sides, task A is thrown to controller A and task B is thrown to controller B. For the same task, only one controller is controlled at any time.
3. A/P: Active/Passive: For a specific LUN, the target port of one controller in its path is in the active / optimized (active/optimized) state, and the target port of the other controller is in the standby (standby) state. The load balancing and task processing modes are similar to those of ALUA.

In this case, it seems that the ALUA mode is used. However, you can view the configuration in the memory. There is a Enable ALUA for the initiator attribute. By default, this option is not selected, and I do not select it during configuration.

Problem: 1. How to configure load balancing between controllers? What is the default mode? 2. If four network connections on the are used, load balancing can be implemented between controllers when load balancing is implemented within the control plane (A/A mode and how to configure the load balancing mode).