1. Dell Technologies. (2023). Dell PowerStore: Networking Guide for PowerStore T Models. Page 15
Figure 5
"PowerStore T model with VLT/vPC". The document explicitly shows the diagram from the question and describes it as a recommended high-availability configuration using VLT for Dell switches.
2. Dell Technologies. (2022). Dell PowerStore: Network Best Practices. Page 10
Section 3.2
"Switch redundancy". This guide states
"To ensure high availability at the network layer
Dell Technologies recommends using two switches for all PowerStore front-end and storage networks... Dell Networking switches support Virtual Link Trunking (VLT)..."
3. Dell Technologies. (2023). Dell PowerStore: Introduction to the Platform White Paper. Page 23
"Network resiliency". The paper recommends "a redundant pair of network switches for all PowerStore traffic. Technologies such as Virtual Link Trunking (VLT) on Dell switches... can be used to provide switch-level redundancy."