For an AFF A220 system, a multipath high-availability (HA) configuration requires two dedicated connections between the controllers to ensure redundancy for the HA interconnect. According to NetApp's hardware documentation, the onboard 10GbE/UTP ports e0c and e0d are designated for this purpose. To establish multipath HA, port e0c on the first controller must be connected to port e0c on the second controller, and port e0d on the first controller must be connected to port e0d on the second controller. This creates the two necessary paths for a resilient HA interconnect.

A. Ports 0a and 0b are typically designated for data traffic or cluster interconnect in a switched configuration, not the HA interconnect on an AFF A220.

B. This is an incorrect combination of ports. The HA interconnect requires specific, pre-defined port pairs (e0c and e0d) for proper functionality and redundancy.

D. This is also an incorrect port combination. Using a mix of data and HA ports for the interconnect is not a supported configuration for multipath HA.

1. NetApp AFF A220 and FAS2700 Installation and Setup Instructions. In the section "Cable a two-node switchless cluster," the guide explicitly shows and instructs to use ports e0c and e0d for the cluster and HA interconnect. The diagram illustrates connecting port e0c on Controller 1 to e0c on Controller 2, and e0d on Controller 1 to e0d on Controller 2. (Document available via the NetApp Support Site, search for "AFF A220 Installation").

2. NetApp Hardware Universe (hwu.netapp.com). By selecting the AFF A220 platform and viewing the port details, the documentation confirms that ports e0c and e0d are the designated 10GBASE-T ports used for the HA and cluster interconnect in switchless configurations. This is the standard for establishing multipath HA on this model.