SCv2020 storage path issue

Hi

we have three VMware esxi 6.0 hosts, connect to one scv2020 storage, through 2 brocade 300 8Gb FC SAN switches. 

our cabling and san switch zoning config are follow the scv20x0 deployment guide, but we get this warning.

Does anyone have any idea help us to fix this issue ?

Regards,

Gary