Aria Operations for Networks (AON) can be used to visualize VSAN traffic flows between ESXi hosts.
Aria Operations for Networks 6.x
Query to visualize all the vSAN traffic grouping by destination host and total traffic
max(traffic rate) of flows where port = 2233 group by destination host order by sum(Total Traffic)
Query to metrics of all vSAN datastore
Sum (RW IOPS), Avg(Read Latency) of Datastore where Filesystem Type = 'VSAN' group by Name