When we talk about production environment, every administrator should consider all possible single point of failures (SPOFs) and resilience in architecture. Here, we are talking about network to the VIOS and LPARs and this architecture removes maximum possibilities of SPOF in terms of network and provides a separate network that can communicate with back up server, access application, and databases swiftly.
This kind of architecture is widely used, where users are accessing the server 24x7, and administrator wants to back up data without impacting the user's bandwidth.
Figure 1. Architecture diagram
In this architecture, we have two VIOS instances, with two separate Host Ethernet Adapters to each VIOS, and it will be dedicated to the respective VIOS in the promiscuous mode. Each HEA incorporates one Shared Ethernet Adapter.
Two Ethernet adapters of each VIOS are connected to different networks (public and private) and every LPAR will be having a minimum of two virtual Ethernets with different virtual LAN (VLAN) IDs.
For better understanding, we divide the configuration in to two steps.